Is the normal force not doing any work?
法向力不做功吗？
Then we have a normal force here-- NQ I call that NQ.
这里有个法向力-,称之为。
And then there is the normal force perpendicular to the surface.
这个力，垂直于斜面。
So there is no force along the arc, but there must be a normal force.
所以在弧线上没有力，但是肯定存在法向力。
Enhancement of the vortical effect can benefit both the side force and the normal force.
涡系诱导作用增强，对侧向力和法向力都有增值。
The third is the normal mutual trasfer of labor force between cities and villages.
第三是正常开展城乡之间的劳动力交流。
The third is the normal mutual trasfer of labor force between cities and villages.
第三是正常开展城乡之间的劳动力交流。
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