你必须先让污水排出去，然后再清洗管道。
First you must drain the dirty water out and then clean the pipe.
当水位高于密封箱时，管道就把浆液排出。
This pipe removes the slurry, which is above the level into the seal box.
安装这些管道是为了将雨水从房子里排出。
These pipes are provided to allow rain water to run away from the house.
每部份处理管道的所有高点都应适当通风以便空气排出。
All high points of each section treated shall be properly vented for air escape.
每部份处理管道的所有高点都应适当通风以便空气排出。
All high points of each section treated shall be properly vented for air escape.
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