... 维护保养 maintenance and repairing of air-conditioning 给排水系统 water and drain system 设备维修 maintenance of equipment ...
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Build a model of a house water and drain system.
造一个房屋给排水系统的模型。
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。
For extra reassurance, the gutters catch excess water and drain it away through the sewage system.
另外还保证排水槽可以保存过量的水并且通过排水系统排出。
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