圆点;
Well, remember we said yesterday that the line integral of F dr, Tds maybe I should say F dot T ds now, because the vector field is tangent to the circle.
记住昨天提到过的,Fdr的线积分,或者F•,因为这些向量都是圆的切线。
In the end, only circle around the dot was used.
结果, 只有这个圆点外的圈被使用了.
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