In no case can we negotiate with a terrorist organization.任何情况下我们都不会和恐怖组织谈判。

In no case should you fight back.无论如何你都不应该反击。

I guess we've already talked about this but I'll ask you again just in case.我想我们已经谈过这个问题了, 但我还是再问你一次, 以防万一。

Take some money, just in case.带一些钱, 以防万一。

Extra boiling water should be kept at hand just in case it is needed.应该多准备些开水在身边, 预防口渴。

Keep a torch handy just in case there's a power cut.放一个手电筒在手边, 以防停电。