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。

youdao

The force-feedback or haptic controller is a pistol-grip design with a trigger to activate movement and a thumb-controlled side button to open or close the gripper.

该力反馈与触觉控制器使用了手枪握把的设计，并带有一个触发器用来启动动作以及一个由拇指控制的侧方按钮用来控制机械手爪的开闭。

youdao

We did have to be somewhat mindful when reading an e-book, for example, as any accidental encroachment of the thumb onto the edge of the screen can trigger a page flip.

ENGADGET: Samsung Galaxy Note 8.0 review