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1·To ensure a secure connection between the arm and the disc nut, split pin is used.

为了确保臂杆和阀瓣螺母之间的安全连接，使用了开口销。

2·The failure of something as small and inexpensive as a split pin can result in the loss of the propeller.

开尾销之类小东西和便宜东西的故障会导致螺旋桨的损毁。