颐和园位于北京市西北郊，原名为清漪园，始建于公元1750年，是清朝乾隆皇帝为其母亲庆祝60寿辰而建造的一座以湖光山色蜚声于世的大型皇家园林。
It was originally named Qingyi Garden. It was first constructed in 1750 by Emperor Qianlong of Qing Dynasty, to celebrate his mother’s 60th birthday.
本系统是为北京市建筑节能墙体材料建立的计算机管理信息系统。
This computer management information system is set up for wall material of building energy saving in Beijing.
以2008年全年的数据为例，北京市市区空气单位体积微小聚合颗粒数是世界卫生组织标准的6倍。
The average concentration of particulates in city air during 2008, for example, was six times the ideal standard recommended by the World Health Organization.
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