When in doubt, use your own gear.

如果有疑问，请使用自己的装备。

youdao

When in doubt, if you're having some weird character issue, odds are you need to escape it in some way.

当你有疑问时，如果你有一些奇怪的性格问题，很可能你需要用某种方式来摆脱它。

youdao

When in doubt, tell the truth.

有疑问时，就说真话吧。

youdao

And when,responding to the cheers, he lightly doffed his hat, No stranger in the crowd could doubt 'twas Casey at the bat.

VOA: special.2011.04.04

So, when in doubt, if you're having some weird character issue, odds are you need to escape it in some way.

如果你有拿不准的字符,可能就要用到转义字符了。

哈佛公开课 - 计算机科学课程节选

And in general, what I would say is, when in doubt, use parens. OK.

因此通常上，我会告诉大家的是，当有疑问的时候，请用括号，好。

麻省理工公开课 - 计算机科学及编程导论课程节选

For too many teachers, the motto seems to be: When in doubt, walk out.

WSJ: Striking Against Students

Occam, the priestly mathematician, said when in doubt the simplest answer is the right one.

FORBES: The Economics Of The Recent Era Are Dead

When in doubt, err on the side of formality, addressing new acquaintances as "Monsieur" and "Madame".

ECONOMIST: Business travel