One day, my carefree get boring, use a knife to scrape a few on the corners of the desk.
一天，我闲得无聊，就用小刀在旮旯的写字台上刮了几下。
When a back and forth handle on the boring bar is rotated, the boring bar falls back and the pin can quickly dismount the knife.
当转动机床镗杆进退手柄使镗杆向后退时，销子就可快速的把刀具卸下。
When a back and forth handle on the boring bar is rotated, the boring bar falls back and the pin can quickly dismount the knife.
当转动机床镗杆进退手柄使镗杆向后退时，销子就可快速的把刀具卸下。
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