排水系统将来自每家每户，办公室和工业中的废水排到水中。
Sewerage systems carry wastes from homes, offices, and industries into water.
Sara离开了房间一下，Michael突然站起，将另一个纸鹤偷偷放入了医务室的排水道里。
Dr. Tancredi exits the room for a moment, and Michael jumps up, sneaking another origami swan into the drainage grate in the infirmary floor.
Michael告诉他哥哥，他找到了通往医务室大楼的路径，但他需要想个办法出来，能够不用梯子就爬上20英尺高的垂直排水管。
Michael tells his brother that he found their access to the infirmary building, but he'll need extra time to find out how they'll get up a twenty foot vertical drain pipe without a ladder.
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