Floor mark to describe small route and narrow channel.
地面记号用来描绘小路及狭窄的通道。
Tradition water-sealing floor drain just separates the room space with channel by storing water.
传统水封地漏，只靠存水把居室空间和管道隔开。
Tradition water-sealing floor drain just separates the room space with channel by storing water.
传统水封地漏，只靠存水把居室空间和管道隔开。
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