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。

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。

Mark beginning of this row using safety pin or split ring marker (for ease in measuring for neckline placement).

用安全别针或可分离记号圈split ring marker标识该行便于度量。