The current stack frame is empty.
目前的堆叠框架是空的。
Evaluates an expression based on the current stack frame.
根据当前的堆栈帧计算表达式。
Stores a reference to the caller of the current stack frame.
储存目前堆叠框架之呼叫端的参考。
The stack pointer tells you where the end of your current stack frame is.
堆栈指针给出的是当前堆栈框架的结束位置。
Then the current stack frame is set to that frame (in this case, the second frame).
则当前堆栈帧设置为该帧（在此种情况下，为第二个帧）。
Then the current stack frame is set to that frame (in this case, the second frame).
则当前堆栈帧设置为该帧（在此种情况下，为第二个帧）。
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