?doub的讀音為 /dab/，是一個(gè)名詞，意為“懷疑”或“不信任”。它也可以作為動(dòng)詞，意為“懷疑”或“不相信”。

doub的用法：

1. 作為名詞，常與介詞about連用，表示對(duì)某件事情的懷疑或不信任。：I have doubts about his ability.（我對(duì)他的能力有所懷疑。）

2. 作為動(dòng)詞，常與that從句連用，表示對(duì)某件事情的懷疑或不相信。：I doubt that he will come.（我懷疑他會(huì)來(lái)。）

doub的例句：

1. She has her doubts about the new policy.

（她對(duì)這項(xiàng)新有所懷疑。）

2. I doubt whether he can finish the project on time.

（我懷疑他能否按時(shí)完成這個(gè)項(xiàng)目。）

3. He is a man of few words, which makes me doubt his sincerity.

（他是個(gè)話少的人，這讓我對(duì)他的真誠(chéng)產(chǎn)生了懷疑。）

4. I have no doubt that she will succeed in her career.

（我毫不懷疑她會(huì)在事業(yè)上取得成功。）

5. The evidence is enough to cast doubt on his innocence.

（這些證據(jù)足以讓人對(duì)他的清白產(chǎn)生懷疑。）