ability, capability和capacity三个名词都有“能力”的意思,区别如下:
1.ability的含义较广,主要指人具有从事体力或脑力劳动的能力,并且暗含能够干好的意味。其复数形式表示“才能,专门技能”,其后常接to do sth.或in / for sth.。
如:She has the ability to do the job. 她有能力做好这项工作。He found the company more suited to his abilities. 他找到了更容易发挥他才能的公司。
2.capability的含义与ability相似,但它既可以指人,又可以指物。其复数形式常常表示“潜在的能力”,其后接to do sth. / of doing sth. / for sth.。
如:He has the capability to complete this job. 他有能力完成这项工作。Our country has the capability to defeat any intruder. 我国有能力战胜任何侵略者。
3.capacity指人或物的容纳或吸收能力,其后接for sth. / of sth.。
如:His capacity for languages is wonderful. 他学语言的能力极好。The hall has a capacity of five hundred people. 这个会堂可以容纳五百人。
Ability, capability, and capacity are synonyms in many of their uses. All are frequently used to refer to one’s power to perform an action. For example, one might have the ability, capability, or capacity to read two books in a week. But capacity—which is extended figuratively in the senses it shares with the other verbs—has special uses it doesn’t share with the others. It tends to relate to volumes and quantities; for example, in the sentence, “The vehicle’s fuel capacity is 120 gallons,” capacity refers to the measure of the vehicle’s ability to hold and is not interchangeable with the other two verbs. “The vehicle’s fuel ability” would not sound right.
Another distinction commonly drawn between ability and capacity holds that, in humans and animals, capacities are inborn, while abilities are learned. For instance, a child might be born with the capacity to become a chef, but the ability to cook must be learned
Capability, meanwhile, often refers to extremes of ability. For instance, if you say you have the ability to write well, I might ask whether you have the capability to write a 10-page essay by tomorrow. Also, capabilities tend to be either-or propositions, while ability tends to come in degrees. For example, I might say that while I have the ability to write, I don’t have the capability to write a novel. But as with most of the other distinctions between these words, the lines are blurry, and the words are interchangeable despite the general usage patterns.
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