[uncountable, countable]a sweet fizzy drink (= with bubbles), that does not contain alcohol, made from ginger and the roots of other plants. It is drunk especially in the US.根汁汽水(用姜和其他植物的根制成,不含酒精,盛行于美国)
[countable]a bottle, can or glass of root beer一瓶(或听、杯)根汁饮料