foolproof ['fu:lpru:f]

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簡單可靠的（形容詞）

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(adjective) So effectively designed as to be unaffected by possible human error or incompetence.

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EXAMPLE: Concerned about security, the company created a foolproof identification system that only permitted employees to enter the factory.

出于安全考慮,，公司制作了一套簡單可靠的識別系統(tǒng)，僅允許員工進入工廠,。

to be up a tree

身陷困境

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To be in a difficult, embarrassing, or hopeless position.

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EXAMPLE: All of our company's sales people quit last week to form a rival business, and now we are up a tree.

我們公司所有的銷售人員上周都辭職并組建了一家競爭企業(yè),，現(xiàn)在我們身陷困境。