方向：面相切接触，并与物体的相对运动趋势的方向相反。

Direction: physiognomy tangential contact with, and objects with relative movement trends in opposite directions.

youdao

方向：面相切接触，并与物体的相对运动趋势的方向相反。

Direction: physiognomy tangential contact with, and objects with relative movement trends in opposite directions.

youdao