As a global society, therefore, tackling food waste will help contribute towards addressing a number of key resource issues.

因此，作为一个全球社会，处理粮食浪费问题将有助于解决一些关键资源问题。

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Most number systems, then, are the by-product of two key factors: the human capacity for language and our inclination for focusing on our hands and fingers.

因此，大多数数字系统都是两个关键因素的意外结果：人类的语言能力及我们对手和手指的关注倾向。

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The number that you choose to rotate your letters by is what we call in cryptography, a key.

你选择的旋转字母的数量就是我们在密码学中所说的密匙。

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"Our alliance with Japan is key to a number of important regional and even global issues,"

VOA: standard.2009.08.31

If you have some plain text, some message that you want to send, well, you can encrypt it or you can scramble it using a key, a secret key, which might be a physical machine like the Enigma 13 or it might be a number like 13.

如果你有没有加密的文本，你想要寄送的一些消息,你就可以加密它,或者你可以用一个密钥使其变得混乱，那就像一个英格玛的物理装置,或者他就是一个数字。

哈佛公开课 - 计算机科学课程节选

The number that you choose to rotate your letters by is what we call in cryptography, a key.

你选择的旋转字母的数量,就是所谓的加密学，一个密钥。

哈佛公开课 - 计算机科学课程节选

Our magazine is also out pacing its competitors in a number of key areas.

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Similarly, they are also encouraged to adhere to treatment guidelines for a number of key conditions.

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Police say a number of key film personalities have received threats in recent years.

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