doubt的意思是：疑惑；疑问；不确定；不相信。

2、例句：

a feeling of doubt and uncertainty.迟疑不定的感受

There is some doubt about the best way to do it.这件事怎么做才是最佳办法有点吃不准。

There is no doubt at all that we did the right thing.毫无疑问我们做得对。

New evidence has cast doubt on the guilt of the man jailed for the crime.新的证据使人们对这个犯罪入狱的男子是否有罪产生了怀疑。