First you must drain the dirty water out and then clean the pipe.
你必须先让污水排出去，然后再清洗管道。
Periodical inspection and maintenance of water supply system, supplying pipe, tape and tank, drain pipe.
给水装置的管线、头、箱及排水管道的定期检查和维修。
Open the pipe to let the water drain off.
把管子打开，让水流出去。
A water-spraying device is composed of a drain pipe and a water-spraying plate.
由泄水管和梳形散水板组成淋水装置。
A water-spraying device is composed of a drain pipe and a water-spraying plate.
由泄水管和梳形散水板组成淋水装置。
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