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day是可数名词 但是有些地方就不能加s 所以就有些区别。
day
n.一天;一日;白昼;白天;工作日;一天的活动时间
复数: days
例句:
The day should be mainly dry with sunny intervals.
白天大部分时间应无雨,间有阳光。
相关介绍
They sleep by day and hunt by night.
他们白天睡觉,夜晚捕猎。
Well, that's my good turn for the day.
好啦,这就是我今天做的好事。
He must be 70 if he's a day!
他至少70岁了!