doubtful

例句

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

我对在网上买二手自行车有些犹豫。

播放英音

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

仅靠拓宽道路能否解决快速发展城市的交通拥堵问题，尚存疑问。

常用搭配

• doubtful about｜对……不确定
• doubtful whether｜是否……尚不确定
• of doubtful value｜价值存疑的

词形与相关词

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

用法提示

人作主语常用 doubtful about；也可用 doubtful whether。