我真的不理解这到底有什么意义，简直是愚蠢透顶。I don't see the point in it really. It's just stupid.我真应该跟我这些愚蠢的朋友理论理论！I shall have words with these stupid friends of mine!基于如此不完整的证据采取的任何行动都是愚蠢的。Any action on the basis of such fragment...
这一承诺能维持多久还不确定。It is an open question how long that commitment can last.南希不确定德克是不是在勾引她。Nancy wasn't sure if Dirk was making a pass at her.如果能重新活过，我不确定自己是否愿意做出任何改变。I doubt I would change anything if I had my time agai...
衡量某事物的标准a yardstick by which to measure sth在他相信某事物之前要先取得证据.He wanted proof before he would believe something.对某人来说,某事物仍然备受争议.Something remains to be a subject of controversy to sb....