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what's to keep it from happening again

如何才能阻止它再次發生呢？

`what's to keep... from doing something` 是一個口語疑問句式，用來詢問「有什麼能阻止/避免某事發生呢？」這裡 Jake 用它來表達擔憂，不知道如何才能防止同樣的壞事再次發生。

It's like, why do the worst things always happen to the best people?

And what's to keep it from happening again?

We are. Come on. We're taking you home.