The closed line forms the outer edge of the surface.

封闭线构成了表面的外缘。

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An electric line of force is also a closed line; it too forms a loop and returns on itself.

电力线也是一条封闭线；它形成一个圈，返回原处。

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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。

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You can imagine having many lines of code where all of a sudden your closed quote is on the next line all the way on the left.

你可以想象一下，这有很多行代码,突然一个后引号,移到下一行最左边。

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Although rail services were to run on the Tarka Line between Exeter and Crediton, beyond Crediton was to remain closed, line managers said.

BBC: Devon and Cornwall rail lines 'expected to reopen' soon

The railway line between Great Malvern and Hereford earlier reopened after a collapsed pipe caused a hole and closed the line.

BBC: New Worcestershire flood defences 'working well'

Five days later, SPY closed on support (line b) and then closed below it the following day.

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