只是沿着曲线流动，所以通量为零，F与C相切。
They are just flowing along the circle around and around so the flux will be zero. F now is tangent to c.
设计想法是基于这样的前提，一个空间应该作为儿童幸福的真正引擎，空间里曲线流动，强调动态游戏的感觉。
Design idea is based on the premise that a space should operate as a true engine for child happiness, where curved lines flow in space, emphasize the sensation of dynamic play.
结果表明，金属流动曲线起伏很大。
The results indicate that the metal flow curve wavily fluctuates.
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