As the mechanical switch has no function of automatic locking and returning to zero in power failure, there exists some potential danger when used in places where safety is called for.

机械式电源开关不具备停电自锁和断电回零等功能，在一些特殊的安全要求较高的场所，使用这种开关也存在着一定的安全隐患。

youdao

This just means hexadecimal notation, which we'll come back to before long so really it just means it's returning the 0 address zero.

这表示的是16进制,我们等下还会讨论，表示的是返回,地址。

哈佛公开课 - 计算机科学课程节选

Since then, a lot of us (me included) have started believing that we are returning to zero-sum economics (or even negative-sum economics).

FORBES: Warren Buffett, Peter Thiel and the Return to Zero-Sum Economics