Every time you write to a tied scalar variable, you invoke its STORE method.

每次写绑定标量变量时，都会调用它的STORE方法。

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We also know that op is a scalar variable because it is prefixed with the $.

我们还知道 op 是标量变量，因为它的前缀是 $。

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Line 2 shifts the first word off of the arguments to the script and places it in the scalar variable op.

第2行将第一个词从对脚本的参数中移去，并将其放入标量变量op中。

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