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这最后的操作叫“拖管”，它使管道就位于河床下面。
This final operation is the"pullback"and installs the line pipe under the river.
youdao
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把管子拖在地上搬运时要注意不使管的外部损伤。
Make sure not to get any pipes surface hurt when carrying on groud.
youdao
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把管子拖在地上搬运时要注意不使管的外部损伤。
Make sure not to get any pipes surface hurt when carrying on groud.
youdao