双语例句:
上海龙凤1314 Stop fussing around and find something useful to do!
别瞎忙活了,找点有用的事干!
Your local library will be a useful source of information.
你们当地的`图书馆就是很好的资料来源。
It's a useful introduction to an extremely complex subject.
上海龙凤1314 这是对一门极为复杂的学科的有益入门教程。
It's useless to fire away with such trivial details.
上海龙凤1314 喋喋不休地谈这些琐碎细节是无用的。
上海龙凤1314 When it comes to getting things done, he's useless.
一涉及做事,他便不中用了。