链接寄存器保存区存有被调用函数（而非当前函数）的链接寄存器内容。
The link register save area holds the link register contents of the function being called, rather than for the current function.
在这个例子中，缓冲区的所有权已经被有效地转移，因而进行调用的代码必须假设在被调用方法返回时缓冲区已经被删除。
In this case, the ownership of the buffer has been effectively transferred, and the calling code must assume the buffer to have been deleted when the transferee method returns.
对strerror的其他调用将会覆盖该缓冲区的内容。
Additional calls to strerror will overwrite the contents of that buffer.
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