Every time a function is called, a new stack frame (an area of memory inside the stack) is used to support the call.
每当调用一个函数,就会使用一个新的堆栈帧来支持该调用。
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The undecorated framesupport is a result of an entry in Sun's bug database, bug ID 4038769 from March 1997, and frame zooming support was requested in August 1997 with bug ID 4071554.