Visitors may use the swimming pool between 7 a.m. and 7 p.m.
访客从早上7:00到下午7:00可在游泳池游泳。
《牛津词典》
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The invitation says guests should arrive between 7:30 and 7:45, but our experience is that there are always a few who like to arrive early, so we'll expect the first people at 7:15.