put all your eggs in one basket

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to depend for your success on a single person or plan of action

孤注一掷;在一棵树上吊死

I'm applying for several jobs because I don't really want to put all my eggs in one basket.

我申请了好几份工作，因为我可不想在一棵树上吊死。

The key word here is diversify; don't put all your eggs in one basket.

这里的关键词是多样性;不要在一棵树上吊死。