Although many people think you should save them in case you need to return a purchase, it's not the smartest idea.
尽管很多人认为，为了以防万一退货，你应该收集它们，但是那不是最聪明的想法。
Even if you don't use them, you should be able to save $89 over the one-way fare.
即使你不用它们，和单程票比，你也可以省下89美元。
Now you can see why our earlier rules for the simplified ABI required that only registers 3 through 12 should be used: the others are non-volatile and require stack space to save them!
现在您可以看到为什么简化abi之前的规则要求只使用寄存器3到寄存器12：其他寄存器都是非易失性的，需要堆栈空间来保存这些寄存器的值。
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