在您调用函数时，仅运行相应的片断。

You only run these segments when you call the function.

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在重命名操作受到支持之前，该函数仅接受固定的参数。

Before rename operations were supported, the function took only the fixed arguments.

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值得庆幸的是，大多数函数仅需要报告少数可能的错误，因此，要恰当地处理它们亦非难事。

Luckily, most functions will only have a few possible errors to report, so it's usually not that hard to handle them appropriately.

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