Using a separate file to indicate a lock is an example of an advisory lock, not a mandatory lock.

使用单独的文件来表示锁，是“劝告式(advisory)”锁而不是“强制(mandatory)”锁的一个例子。

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Seat belts are the only mandatory equipment, and the increase in car buying hasn't boosted demand for airbags or anti-lock brakes, automakers said.

安全带是强制安装的设备，但是增加的汽车购买者并没有对安全气囊或防抱死制动系统的需求，汽车制造商说道。

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