改成：奉茶期间，主人要仔细观察客人茶杯里的茶量。While severing tea ,the host should pay close attention to the guests’ cups, refilling as frequently as necessary.
个人觉得
观察可能用observe好一点，然后茶杯里的茶量可以用其他短语代替比如“The remaining tea in the cup”
如果有说错请指出，见谅
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