【1】per 为介词：主要用来表示比率、价格，速度，比例等每，每一Rooms cost ?50 per person, per night.房价每人每晚50英镑。These apples cost five yuan per kilogram.这些苹果每公斤五元。The vessel tax of anchorage is 5,000 dollars per year.这艘船的停泊税一年是五千美元。Tickets to the concert are $50 per head!这场音乐会的门票价格是每人五十美元。The goods were shipped per steamer.货物由船舶运送。This car runs 60 miles per hour每小时60英里Social Security refused to pay her more than ?17 per week.社会保障部门拒绝每周向她支付17英镑以上的钱。Buses and trains use much less fuel per person than cars. ?公共汽车和火车的人均燃料耗费量比轿车小得多。【2】every 为限定词：每一/每一个主要用来指在特定的一个(数量大于等于3的）群体中的每一个的概念，且这个群体的数量必须是大于或者等于3个。同时强调整体概念。She knows every student in the school.她认识学校里的每一个学生。I could hear every word they said.他们说的每句话我都能听见。We enjoyed every minute of our stay.我们逗留期间每一分钟都过得很愉快。?Every village has a green, a church, a pub and a manor house.每个村庄都有一片绿地、一座教堂、一间酒馆和一座庄园宅第。Record every expenditure you make. ?记下你的每一笔花销。