构建一个想象中产品的结构的最好仿真工具，测定其合理性，推荐产品的相关参数，开发系统产品的首选。 有空玩玩，确实不错，就算当成玩具也很有乐趣。

BEIJING, Dec. 23 (Xinhua) -- Chinese researchers have developed a new air quality model that enables more accurate simulation of two major pollutants: fine particulate matter and ground-level ozone.