n. circuit
misc. closed curve
... simply-connected region 单连通区域 closed curve 闭曲线 Green’s theorem 格林定理（公式） ...
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沿这条闭曲线，从原点出发。
如果是一条闭曲线，也可以用二重积分来代替的。
If it is a closed curve, we should be able to replace it by a double integral.
实际上这对任何闭曲线都适用，向外的通量还是面积的两倍。
It is true actually for any closed curve that the flux out of it is going to be twice the area of the region inside.
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