The work in this step is just the area under this curve.
而这一步过程的功,是这条曲线下面的面积。
If we have a closed curve then the line integral for work is just zero.
如果给定一条封闭曲线，那么求所做功的线积分为零。
And, we want to find the work done along the curve.
我们想找出沿一条曲线所做的功。
And, we want to find the work done along the curve.
我们想找出沿一条曲线所做的功。
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