if in doubt
used when advising someone what to do if they are uncertain about something
当某人对某事不确定时,建议他做某事时就用这个短语;翻译为“如果不确定的话,如果拿不定注意的话”
A: When I go to the shop, should I lock the door, or leave it open?
当我去买东西的时候,我应该锁门,还是让门开着?
B: If in doubt, lock the door. You don't want somebody to burgle you.
如果拿不准,就把门锁上。你总不希望有人偷你的东西吧。
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