just one cup是只要一杯。例句：
1 It's just one cup. that's all, I promise.一杯而已，我保证。
2 Just one cup of watermelon has 1.5 times more lycopene than a large fresh tomato.一杯子西瓜汁所富含的番茄红素是一个新鲜大番茄的1.5倍。
3 Eh, for the sake of everybody's health, just one cup for each person. ( This mean drawf!当然，为了大家的健康考虑，每个人只能喝一杯。（这个小气的小矮子！）4 And those who sipped just one cup of tea each day had a15 per cent lower risk of the disease than non-drinkers.而且每天只喝一杯茶的人比不喝茶的人患肾癌的风险低15%。
