按后盖锁定释放按钮，同时向下滑动后盖插锁，以打开后盖。 收藏。

While pressing the back cover lock release button, slide the back cover latch down and open the back cover.

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这把钥匙插不进那把锁中。

This key won't go in the lock.

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对锁闭齿轮专用插齿刀的设计进行了研究，并讨论了这种刀具设计的基本方法、计算公式以及设计步骤。

The design issue of the special gear shaper cutter for lock gears is researched. The basic method, calculating formulas and procedure of designing the gear shaper cutter are discussed.

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