This final operation is the"pullback"and installs the line pipe under the river.
这最后的操作叫“拖管”，它使管道就位于河床下面。
The pipe operation has failed because the other end of the pipe has been closed.
因已关闭管道操作的另一端而使管道操作失败。
The pipe operation has failed because the other end of the pipe has been closed.
因已关闭管道操作的另一端而使管道操作失败。
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