英汉互译 美国的青少年经常使用电脑 捷克通常上网利用网络资源完成他的作业 我不经常使用我的笔记本电脑

他在网上查阅火车时刻表，但是他从不在网上买车票
大卫经常会从网上下载他喜欢的歌手的歌曲:American teenagers often use computers Czech often surf the Internet use of network resources to finish his homework .I don't often use my laptop.In his web search train schedules, but he never buy online ticket.
David often downloaded from the Internet his favourite singer of songs.

American teenagers often use computers
Czech often surf the Internet use of network resources to finish his homework
I don't often use my laptop

In his web search train schedules, but he never buy online ticket.
David often downloaded from the Internet his favourite singer of songs.