船撞到排水管的管壁而支离破碎。

Then the boat struck against the wall of the drain and broke into pieces.

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一种新型水管，包括管壁和具有管内腔的管状体，其特征在于，所述的管壁(1)上沿轴向设有至少一条凹陷槽(2)。

A novel water pipe, comprising a pipe wall and a tubular body with a pipe cavity, wherein the upper edge of the pipe wall (1) is axially provided with at least one groove (2).

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一般而言，同一规格中，管壁较厚的是热水管，较薄的是冷水管，使用时必须分清楚；

Generally, the same specifications, the wall thickness of the hot water, cold water layer is to manage the use of a need to make a distinction ;

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