So we have if, and that is followed by, I'm going to use angle braces here just to indicates something goes in here, some test followed by a colon.
那么我写了if,后面跟着,我这里会用一个角括号,来代表这里有些东西,冒号后面跟着一些测试。
I'm expecting the value that test to be a Boolean. Followed by a colon.
我希望测试的结果值的类型,是Boolean的,后面是个冒号。
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