How could he explain the wreck to his parents if it happened?

万一发生了车祸，他该如何向父母解释？

金山词霸

There is a supplementary water supply in case the rain supply fails.

万一主水源断了,我们另外有供水的地方.

《简明英汉词典》

Should the weather be rough, we won't be able to go riding.

万一是狂风暴雨的天气, 我们就不能去骑马.

《简明英汉词典》

If something should happen to her, please ring me up at once.

万一她有个好处, 请立刻打电话给我.

《现代汉英综合大词典》

What if anything should happen to him?

万一他有个长短, 怎么办 ?

《现代汉英综合大词典》

What if anything should happen to the child?

万一这孩子出了差错怎么办?

《现代汉英综合大词典》

If peradventure you fail.

万一你失败了.

《现代英汉综合大词典》

If I should fail I would try again.

万一失败,我还要试一试.

《现代英汉综合大词典》

The secret must never get public. If it did, she would be the laughing stock.

这个秘密决不能成为公开的。万一公开了，她就会成为笑柄。

金山词霸

In case of a fire, we should get out of the building immediately.

万一起火，我们应该立即从大楼里撤离。

金山词霸

If the worst comes to the worst and you lose your job, at least I will still be working.

万一出现最坏的情况,你丢掉了工作, 起码我还有工作.

《简明英汉词典》

If it should chance to rain we'll take a taxi home.

万一要下雨的话，我们就乘出租车回家。

辞典例句

There is a supplementary water supply in case the main supply fails.

万一主水源断了，我们另外有供水的地方。

辞典例句

If they should happen to upset you, I'd offer you my apologies! "

万一惊动了你们两位, 我赔不是. ”

子夜部分

He went into Jonesboro with me, in case Wilkerson got me first.

他同我一起去琼斯博罗, 怕万一威尔克森先伤了我.

飘（部分）