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1. Oxford Dictionary

   light water

   • IPA[ˌlʌɪt ˈwɔːtə]

   英式

   • n.
     water containing the normal proportion (or less) of deuterium oxide, i.e. about 0.02 per cent, especially to distinguish it from heavy water.；foam formed by water and a fluorocarbon surfactant, which floats on flammable liquids lighter than water and is used in firefighting.

   • noun: light water