They do not know what the purpose of the cave was.

VOA: special.2010.08.03

You can hold up in a cave or somewhere and do this.

这样找个洞穴也能进行。

普林斯顿公开课 - 人性课程节选

Always attempt to be reasonable, respectful and persistent, but do not cave in.

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If Republicans become obsessed with their agenda and refuse a reasonable deal, and the Democrats do not cave, the executive branch will be faced with an inability to continue its operations.

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If Silicon Valley helped you get rich and happy, do you go into your cave and savor your winnings?

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