看绝望的主妇学高频短语：Just in case

Just in case: to protect against something bad that could happen; We do something to prevent a problem; as a way of being safe from something that might happen or might be true. As in I’ll take my umbrella too, just in case.

中文释义：just in case修饰动词，在句中作状语，说明某种行为只是为了以防万一，以备不时之需的意思，通常是用在＂觉得有事情会发生而先做准备＂的时候使用。例句：I advise you to prepare one more battery just in case.（我建议你再准备一个电池以防万一。）