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。
2
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。
3
The number that you choose to rotate your letters by is what we call in cryptography, a key.