本文研究了聚变装置真空室上的涡流问题，将真空室上的涡流看作面电流密度并定义一矢势的法向分量来描述它。

This paper deals with the eddy currents on the vacuum vessel of fusion devices. The eddy currents on the vessel are considered as surface currents and described by the normal components of a vector.

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我们需要的一个综合性的解决方案，是有的矢的方案。

What we need is a portfolio of solutions, horses for courses, " said Shepherd.

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那么如果过一段时间，这就有一个向量△,它是位矢经过一段时间的改变量。

r So, if we wait a certain amount of time, we'll have a vector, delta r, which is the change in position vector a various interval of time.

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At every instant, it's got a location given by the vector R; R itself is contained in a pair of numbers, x and y, and they vary with time.

在每一个瞬时,它的位置由位矢 R 给出,R 本身包含了一对坐标值 x 和 y,并且它们都随着时间的变化而变化

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