高分请帮忙修改一段英文原文，急用！

我看楼主对有些答复很无奈，我很理解。我的答复完全杜绝机译，改写过程中语法保证准确，请审阅。
As we know industrialization began in the 18th century, since then new sales and distribution channels were required thereby affecting the trade fair business. During the 18th and 19th centuries, fairs became the site displaying a variety of available goods instead of the sites for direct sales, in such kind of fairs only samples of much more diverse product ranges were exhibited. These fairs were called Sample Fairs (from the German "Mustermesse"). The first exhibition site for a sample fair was in Leipzig in 1895. Untill the middle of the 20th century these sample fairs dominated the fair scene in Europe. In addition, at the end of the 19th century, and in the early decades of the 20th century, several exhibitions of national significance were organized, most of them were dedicated to a specific theme such as electricity, health, mechanical engineering, and they primarily oriented to the general public.
After World War II, with the rising specialization of the economy a large amount of specialized fairs and a broader diversity of fair locations arose. Although high-speed, electronic communications technology had rapid progress during the 20th century; fairs today are still considered as one of the most dynamic and effective sales and marketing tools in existence. Entering the 21st century, the fair business features an increasing supply of fairs and exhibitions: the activity field of fair organizers has been expanded into the worldwide level through international co-operations.
It is well known that a lot of new and large exhibition sites have been built or are under construction in China, Korea, Singapore and the Near East, beecause these countries place their expectations of economic growth and prosperity on the exhibition industry. Some Asian organizers start to hold their own exhibitions in Europe or co-operate with worldwide acting exhibition organizers.
Trade fairs are market events with a specific duration and held regularly. In the trade fairs, a large number of companies present their main products and mainly sell it on the basis of samples. And trade and business men are their main visitors. On the contrary in the exhibitions, a large number of companies present a representative product and sell it or provide information about it just for promoting sales. And the general public is their main visitors.
问题补充：还有一段 As a criteria for an international trade fair and exhibition, the number of participating foreign exhibitors must reach at least 10% of the total number of exhibitors, or the number of foreign visitors must account for at least 5% of the total number of visitors.
In addition to international fairs and exhibitions, there are also national or regional ones. The visitors of For national trade fairs and exhibitions the visitors may come from areas extending beyond a given region, while for regional trade fairs and exhibitions the visitors may come from a specific province or county.

这个貌似非常难...

The industrialization advancement, started in the 18th century, needed the new sale and the retailing channel, thus has affected the fair commercial trade. In the 18th century and the 19th century, the trade fair direct marketing's website has demonstrated the widespread existing cargo truly from the website: Only then sample, diverser product scope display. Because, it is the majority of cargo trade exposition which also does not have possibly to realize again. These expositions are called the sample exposition (Germany “Mustermesse”). Leipzig was the first display scene, organization fair sampling in 1895. Along with scope widespread investment and consumable, these sample trade fair fair stage primarily in Europe, until this century middle period. In addition, in 19 century's ends, in the early several dozens years in the 20th century, the significance which many national displays conducted, mainly devoted to some specific subject, for example, electric power, health care, mechanical engineering, their main purpose in the common public. after Second World War, after the fair trade starts rises tendency specialization economy. The massive specialized expositions and a more widespread multiplicity, the fair place appears. Although appeared high speed, the electronic communications method in the 20th century, the trade fair - takes the temporary market - to continue today to place takes one most powerful and the effective sales and the marketing tool's existence. In the 21st century at the beginning, in the fair commercial characteristic is the supply exposition which and the exposition increases unceasingly: The fair organizer expands its field of activity in the world level, but present is engaged in the international cooperation service. for example, the new large-scale display place completes or China which constructs, South Korea, Singapore and the Near East area. The fast development's country the anticipated economic growth which and the prosperous convention and exhibition industry occurs in these areas. Some Asian organizers start their display, cooperates in Europe or the world, the proxy displays the organizer. the trade exposition is the marketing campaign concrete time and the gap hold. At the trade fair, a large quantities of company present main product is by or many professions, in main sell foundation, sample. Exhibition main attraction trade and commercial visitor. the convention activity is market concrete time, the gap hold. In the display, a large quantities of this company's representative the product scope either many professions and the sell or provide the material, explains its goal promotion. Display main attraction general public.

The process of industrialization, which began in the 18th century, required new sales and distribution channels, thus affecting the trade fair business. During the 18th and 19th centuries, fairs indeed evolved from sites for direct sales to sites displaying a broad range of available goods: only samples of much more diverse product ranges were exhibited. Because of, it was not anymore possible to bring the bulk of the goods to a trade fair. These fairs were known as Sample Fairs (from the German "Mustermesse"). Leipzig was the first exhibition site to organize a sample fair in 1895. With a wide range of investment and consumer goods, these sample fairs dominated the fair scene in Europe till the middle of the 20th century. In addition, at the end of the 19th century, and in the early decades of the 20th century, numerous exhibitions of national significance were organized, mostly dedicated to a specific theme, for example, electricity, health, mechanical engineering, and they primarily aimed at the general public.
After the Second World War, the fair business started following the trend of rising specialization of the economy. A large amount of specialized fairs and a broader diversity of fair locations arose. Despite the emergence of high-speed, electronic communications methods during the 20th century, fairs today - as temporary marketplaces - continue to rank as one of the most dynamic and effective sales and marketing tools in existence. At the beginning of the 21st century, the fair business is characterized by a continuously growing supply of fairs and exhibitions: fair organizers enlarge their field of activities on a worldwide level, while being engaged in international co operations.
For Example, new and large exhibition sites were built or are under construction in China, Korea, Singapore and the Near East. The fast-developing nations in these regions place their expectations of economic growth and prosperity on the exhibition industry. Some Asian organizers start to place their own exhibitions in Europe or are cooperating with worldwide acting exhibition organizers.
Trade fairs are market events of a specific duration and held at intervals. In the trade fairs, a large number of companies present the main products which are from one or more industry sectors, and mainly sell it on the basis of samples. Trade Fairs predominantly attract trade and business visitors.
Exhibitions are market events of a specific duration, held at intervals. In the exhibitions, a large number of companies present a representative product range of one or more industry sectors and sell it or provide information about it for the purposes of sales promotion. Exhibitions predominantly attract the general public.and exhibition, the number of participating foreign exhibitors must reach at least 10% of the total number of exhibitors, or the number of foreign visitors must represent at least 5% of the total number of visitors.
Non-international trade fairs and exhibitions can be sorted as national or regional. The visitors of national trade fairs and exhibitions are from areas extending beyond a given region, while the visitors of regional trade fairs and exhibitions come from a specific province or county.