What's the worst thing that could happen?

情况最坏会怎么样？

《牛津词典》

It's frightening to think it could happen again.

想到此事可能再次发生就使人不寒而栗。

《牛津词典》

This is such an unforeseeable situation that anything could happen.

这是一个无法预见的情形，任何事都有可能发生。

《柯林斯英汉双解大词典》

If resident doctors work shorter hours, for example,mistakes could happen when one resident takes over a patient's care from another.

VOA: special.2009.06.02

Suppose the planet were hit by a comet-- this happened--something like this happened sixty-five million years ago, so it could happen again.

假设这个星球被一颗彗星击中-,这样的事，大约六千五百万年前,发生过，所以它还可能再发生。

耶鲁公开课 - 金融市场课程节选

And if it could happen in New York and it could happen in Michigan, I suppose it could happen in New York and Michigan.

如果它可以发生在纽约，也可以发生在密西根，那我猜它可以发生在纽约和密西根。

耶鲁公开课 - 死亡课程节选

"It blew my mind to think this could happen to someone like me, " Grant said.

CNN: Herbs, vitamins that can hurt you

If there is the political will to make it happen, it could happen before August 2nd.

WHITEHOUSE: Press Briefing

For now they are, but he cautions that a 10% correction could happen at any time.

FORBES: Magazine Article