closed curve

常见例句

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。
That’s a puzzle: On a closed curve, the entropy has to finish exactly where it started, but the arrow of time says that entropy tends to increase and never decrease.
那就出现了一个困惑：在一个封闭的曲线里，一致性必须从它开始的地方结束，而时间的箭头显示一致性会增加，不可能减少。
You know it's automatically OK because if you have a closed curve, then the vector field is, I mean, if a vector field is defined on the curve it will also be defined inside.
它必然成立,因为如果给出一条闭合曲线，然后向量空间是。。。,我是指，向量空间在曲线上有定义,当然在区域内部也有定义。

It says that if in this space any closed-curve object, such as a rubber band, can be shrunk to a point, then the space is topologically equivalent to a sphere.
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