每个嵌套的括号对，从左开始算起，每个左圆括号加一，放在下一个特殊的数字变量中。
Each nested set of parentheses, counting from the left, incrementing at each left parenthesis is placed in the next special, numerical variable. For example.
如果它看到了SWAP，左圆括号，右圆括号，它可能载里面看到两个int数，那是它所需要做的，用来完成代码的编译。
And if it sees S-W-A-P, open parentheses, close parentheses, and it hopefully sees two ints inside of it, that's all it needs to do in order to finish compiling your code.
然后在圆括号内输入左引号。
然后在圆括号内输入左引号。
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