Wind it like a watch with a key that's stored underneath the barrel, and when it's 'fully loaded' use your thumb to pull back the safety lever. Then squeeze the trigger.

用放置在枪管底端的转柄给它像手表一样上发条，当发条“全部上满”之后，用你的大拇指向后拉动枪栓，然后扣动扳机。

In this paper, based on an analysis of the functions and load distribution of the watch lever, a new design for the performance of the component is presented.

本文通过对手表拉挡件功能和受力状态分析，提出外强内韧的性能要求。