You will ask pharmacist when you have doubt about the medication.

当你对药物有疑问时，你会询问药剂师。

youdao

Jurors only need to have a "reasonable doubt" a reasonable question in their mind that the person is guilty as charged.

VOA: special.2009.08.31

.. You mentioned earlier that you doubt... you have questions about whether this high rate of growth is sustainable?

您之前提到过您怀疑。,您质疑印度经济的高增长率,能否保持下去？

普林斯顿公开课 - 国际座谈会课程节选

Milton's similes are notoriously difficult as you no doubt have already experienced.

弥尔顿的明喻众人皆知的,非常难懂，正如你们已经领教过的。

耶鲁公开课 - 弥尔顿课程节选

It's human nature to have doubt and to have your own opinions.

BBC: Rape survivors open up about their experiences

Worse, Mashable published exactly how you can make people follow you, ensuring this problem will soon worsen unless Twitter fixes it fast and I have doubt that they will.

FORBES: Twitter's 2 Follower Bugs

You are an intelligent woman and you have worked as a journalist and I have no doubt you have seen first hand cases of benefit fraud in your newspapers.

BBC: Salisbury church magazine editor loses curfew appeal