If the indoor installation area is subject to freezing temperatures, the water piping must be protected by insulation.
如果室内安装区域可能出现冰冻温度，则水管线必须加装保温层保护。
If the indoor installation area is subject to freezing temperatures, the water piping must be protected by insulation.
如果室内安装区域可能出现冰冻温度，则水管线必须加装保温层保护。
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