您可能从来都不会需要它，而且也还有其它方式引导出问题的系统，但万一需要时有这么一张软盘总是好的。

You may never need it, and there are other ways to boot a problematic system, but it's nice to have around when you need it.

youdao

如果可能的话建议带上一张信用卡预防万一。

If possible carry a credit card for emergencies.

youdao

我们到了兽医店后，以防万一，我想她应该需要一张身份证，谁知道下一秒种会发生什么呢。

While we're there, I reckon she should get an identity chip just in case. There's no telling what the future holds.

youdao