逆时针曲线

Counterclockwise curve

以上为机器翻译结果，快速获取精准的人工翻译结果，建议选择有道人工翻译

1
就会得到一个被逆时针曲线包围的圆盘，法向量向上。
Then, if you had a flat disk with the curve going counterclockwise, the normal vector would go up.
2
如果运用一下格林公式，你就发现当沿着一个逆时针的曲线时，结果就是区域的面积。
And, now, if you apply Green's theorem, you see that when you have a counterclockwise curve, this will be just the area of the region inside.
3
直白的说，只有逆时针的曲线是成立的。
Straightly speaking, that will only work here if the curve goes counterclockwise.

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