以防万一(just)in case牛津词典例句You'd better take the keys in case I'm out. 你最好带上钥匙以防我不在家。 You probably won't need to call—but take my number, just in case. 你很可能无需打电话,不过还是记下我的电话号码吧,以防万一。 In case you're wondering why Jo's here—let me explain...我来解释一下吧, 免得你奇怪乔为什么在这儿。