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The list of directories acts like a stack -- you push a directory onto the top of the stack, and pop a directory off the top again to get it back. 該目錄列表的行為就像一個(gè)堆棧——您將一個(gè)目錄壓入堆棧頂部，并從頂部彈出一個(gè)目錄以取回它。