I often doubt whether it is worth working so hard.

我经常怀疑这么努力值不值得。

youdao

I often doubt whether it is worth spending so much time on my homework.

我常常怀疑把这么多时间花费在作业上是否值得。

youdao

Though I am cynical about the ethical commitment of war correspondents, so often intensely self-centred, I never doubt the brilliance and dedication of the good ones.

虽然我不满于战地记者们的道德承诺，他们是高度的个人中心主义者，但我从不怀疑优秀记者们的才华与献身精神。

youdao