这是因为机器并非尽善尽美，而且这些工具也会老化，确切尺寸也要允许略有误差。
This is because machines are not perfect, and the tools become worn. A slight variation from the exact size is always allowed.
这是因为机器并非尽善尽美，而且这些工具也会老化，确切尺寸也要允许略有误差。
This is because machines are not perfect, and the tools become worn. A slight variation from the exact size is always allowed.
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