反射压力触点，增强按摩效果；

Reflect pressure contact point, increase massage effect;

youdao

触点压力和，mg完全，相同，但是反向相反，否则永远都不会有平衡。

And that contact force better be exactly the same as mg, but in opposite direction, otherwise there could never be equilibrium.

youdao

具有较高屈服强度的材料允许产生较大的触点压力，因为它们可以允许较大的应力。

Materials with higher yield strengths will allow for greater contact forces to be generated, since they allow for greater stress.

youdao