doubtful

例句

I was doubtful about buying a second-hand bicycle online.

我當時對在網路上買二手自行車心存疑慮。

播放英音

It is doubtful whether expanding roads alone can solve traffic congestion in rapidly growing cities.

僅靠拓寬道路能否解決快速發展城市的交通擁堵問題，尚存疑問。

常用搭配

• doubtful about｜對……不確定
• doubtful whether｜是否……尚不確定
• of doubtful value｜價值存疑的

詞形與相關詞

doubt (n.) · doubt (v.) · doubtfully (adv.) · doubtless (adv.)

用法提示

人作主語常用 doubtful about；也可用 doubtful whether。