数学是打开科学大门的钥匙。

Mathematics is the key that opens the door to science.

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互操作性是Web服务想要打开主流计算大门的钥匙。

Interoperability is the key that Web services require to open the door to mainstream computing.

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打开幸福大门的钥匙不是金钱，而是亲密关系。

Close relationship, rather than money, is the key to happiness.

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He journeys heroically through chaos in order to find that new planet that he had heard about in heaven, and he's stopped by a figure who holds the keys to hell's gate and who can determine who is able to leave and who is able to enter.

他英勇地穿越过混乱以找到他在天堂听闻过的新星球,他被一个人拦下了,这个人掌管着地狱大门的钥匙并能决定,谁能够从此间进出。

耶鲁公开课 - 弥尔顿课程节选