So, to say that a vector field with conservative means 0 that the line integral is zero along any closed curve.

一个保守的向量场就是说,沿任意闭曲线的线积分的结果是。

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So, one of them says the line integral for the work done by a vector field along a closed curve counterclockwise is equal to the double integral of a curl of a field over the enclosed region.

其中一种说明了，在向量场上，沿逆时针方向，向量做的功等于，平面区域上旋度F的二重积分。

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The crash began as the field closed in on the finish line, and rookie Kyle Larson's car came upon the wreck and went airborne into the fence that separates the track from the seats.

NPR: Fans Injured When Car Sails Into Fence At Daytona