LR_OFFSET是返回地址的堆栈框架的偏移量。
LR_OFFSET is the offset into the stack frame of the return address.
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当然，在我们的源文件里，偏移量是作为初始地址给出的。
And of course the offset is given as the original address in our source file.
文件偏移和内存地址是不容易的相关。
File offsets and memory addresses are not easily related.
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