There radon concentrations will severalfold to hundred times increasing when using spring water in the hotel rooms.

氡浓度比没有使用温泉水时高出几倍甚至几百倍。

youdao

There radon concentrations will severalfold to hundred times increasing when using spring water in the hotel rooms.

氡浓度比没有使用温泉水时高出几倍甚至几百倍。

youdao