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。
This directive has to be closed using an .endr directive (line 8).
用一个 .endr指令结束这个指令（第 8 行）。
Your call was canceled because the telephony device driver closed the line.
呼叫被取消，因为通讯设备驱动程序关闭了此线路。
Stroke the valve open and closed several times, with no line pressure.
在没有任何管道压力状态下开启和关闭阀门几次。
"Want a window wife immediately then say:" not line, Windows closed and I'll suffocated.
要开窗的太太马上接着说：“不行，车窗关着，我会闷死的。”
A line of code ends before an expression is closed.
某行代码在表达式关闭之前结束。
A line of code ends before an expression is closed.
某行代码在表达式关闭之前结束。
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