操纵杆越长就越容易抬起重荷，而如果你的操纵杆真的过短，那你将在力学上处于劣势。

The longer those handles are, the easier it is going to be to lift up the load. If you had really short handles, you would have poor mechanical advantage.

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压杆抬起，即停机； 盖子没有盖好，机器不能启动； 多重限位开关，保证安全生产；

One interlock stops the machine when the lever is lifted, A second interlock prevents the machine from starting if cover is not in place;

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正确的上挥杆姿势是右手上臂内侧应该紧贴右臂腋窝，右臂手肘与伸直的左臂呈一个倒三角形。然而一些球手在上杆的时候右臂向上抬起而并非紧贴身体。

Correct gesture for back swing is that the right upper arm's inside should be close to right armpit, while right elbow shapes an inverse triangle with unbend left arm.

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