I must think twice before I can promise.

在我答应之前，我必须重新考虑一下。

It would be sensible to think twice before we make a decision.

在做决定之前再三考虑是明智的。

You should think twice about employing someone you've never met.

雇用素不相识的人应三思而行。

Sometimes our opinions are subjective, so we'd better think twice before we make a decision.

有时候我们的意见带有主观性，因此，在做决定之前最好多加考虑。

Recently a campaign against food waste launched online might make you think twice about being so wasteful.

最近网上发起了一项反对浪费食物的活动，这可能会让你重新审视自己的浪费行为。