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1·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。《牛津词典》

2·I have also taken out a life insurance policy on him just in case.

我也给他买了一份人寿保险以防万一。《柯林斯英汉双解大词典》

3·We'd better leave now, just in case.

我们最好现在离开，以防万一。

4·I write a reminder a few days before the date just in case.

我在该日期几天前写一个提醒，以防万一。

5·I'd start looking for alternatives now, just in case.

我就会开始寻找替代的课程，以防万一。

6·I had my camera ready, just in case I saw something that would make a good picture.

我把照相机准备好，万一看到什么值得拍的就可以拍下来。

7·Before you set out, always get warm clothes and raincoats ready, just in case! Even experienced travelers get lost.

出发前，一定要准备好暖和的衣服和雨衣，以防万一！即使是有经验的旅行者也会迷路。

8·I guess we've already talked about this but I'll ask you again just in case.

我想我们已经讨论过了这个问题，但为保险起见，我再问你一次。《柯林斯英汉双解大词典》

9·You'd better take an umbrella just in case of rain.

以防下雨，你最好带把伞。

10·You should keep a first-aid kit in your home just in case there is an accident.

你应该在家里放一个急救箱，以防发生事故。