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We used to feel the temperature of the water that running out of the pipe with our bare hands,and that could end up with burning or freezing because temperature is invisible.if wu could distinguish the temperature by different colors which would make it visible,the problem is solved.
Huang, Xin Shui
Shenzhen, China
Huang Canhong
Huang, Xin Shui
Shenzhen, China
Huang canhong