1·Which one do you like best?
你最喜欢哪一个？
—— 《牛津词典》
2·Which one is heavier?
哪一个更重？
3·Which one of you is Mr. Wang?
你们中间哪一位是王先生?
—— 《新英汉大辞典》
4·Which one works better?
哪一个会做的更好？
5·The difficulty is which one to choose.
困难的是要选择哪一个。
6·Which one is bigger?
哪一个更大？
7·How you going to know which one to go for?
你怎么知道该选哪一个呢？
8·No matter which one you are, it is at both extremes.
不管你是哪一个，都是在两个极端。
9·Rather speak of something at which one may laugh heartily.
说一些让人开怀大笑的事情吧。
10·A symbiotic relationship is an interaction between two or more species in which one species lives in or on another species.
共生关系是两个或多个物种之间的相互作用，其中一个物种生活在另一个物种体内，或依靠这一物种生活。