Hmm. Well, maybe we should double check.

恩，也许我们应该仔细地检查一下。

Let's go back and double check this.

让我们回过头检查一下。

Double check your work for spelling, grammar, and miscommunications.

仔细检查你的作业中的拼写、语法和沟通错误。

Please. Just to double check all the details.

是的。只是再核对一下所有的信息。

Too complicated to even contemplate dating, double check. It's ok.

过于复杂而不能开始新恋情，更好了。这都没什么。

By the way, have you double checked your flight time?

顺便问一下，你确认你的机票时间了吗？

This will help us reference if we need to double check something.

如果我们需要复查一些内容时，这将有助于我们查找。

That's a little direct, instead he said, " Let's double check."

这有点直接，相反，他说，“我们再检查一下。”

Please double check it for me.

请您再清点一下。

And your third strategy is to double check.

而你的第三个策略是二次检查。