light water
noun/ˈlaɪt wɔːtə(r)/
/ˈlaɪt wɔːtər/
[uncountable]- (chemistry) water that contains the normal amount (or less) of deuterium
轻水（即普通水，水中氘含量不超过正常值） - (specialist) a type of foam (= mass of bubbles) used to put out fires
泡沫灭火剂