它与define的作用类似，不过它只是已经定义某个变量之后起作用。

It works just like define but is used after a variable is already defined.

youdao

If you take enough alcohol, it then goes down to inhibit the excitatory parts of your brain and then you fall on the floor and pass out.

如果你摄入足够的酒精,就会抑制在你大脑中起兴奋作用的脑组织,之后你便醉倒了

耶鲁公开课 - 心理学导论课程节选