Just open a hot water valve in a sink or shower and let the system drain.
我们只要打开浴缸或淋浴喷头的热水出水阀，把热水器的水放掉就行了。
In particular, a tub with the tap running and the drain open.
特别是，一个水龙头和排水口都打开的浴缸。
But How Do You Get the Guys to Remember to Open the Drain?
你又怎么让人记着打开排水沟呢？
After turning off the gas or electricity open the drain valve at the tank bottom.
在关闭燃气或电源后可开启罐底的排水阀。
Students check the automatic drain valve of the front end of the valve is open.
检查自动排水阀前端之球阀是否打开。
Open the pipe to let the water drain off.
把管子打开，让水流出去。
To test system functions, please open the valves and drain water out of them.
开启阀门排水来检验系统功能。
A land drain is usually a pipe buried in farm land but it may also be an open channel.
农田的排水系统通常是埋在农田中的管子，但也可以是明渠。
A land drain is usually a pipe buried in farm land but it may also be an open channel.
农田的排水系统通常是埋在农田中的管子，但也可以是明渠。
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