Well, the bracket notation means you can index into this variable.
好的,这个括号的意思是你可以,索引这个变量。
Now I seem to be violating my own mantra here by just calling this variable A, but this is reasonable, I much as with four loops when you just call an incrementing variable I, because you just need an index, well, same here.
现在我好像违背了我自己的意愿,我把这个变量叫做A,但这是合理的,就像我们的for循环中,我们把一个增变量叫做,因为我们只要一个索引,这里也一样。
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