火车站广场由于其空间开阔，空气流动性强，故最舒适的频率也有16%。
The railway station square still had 16% frequency of most comfortable degree, because of its open space and better air fluidity.
北京的地形和气候条件都很适合。空中的烟尘高度很低，而且它地处谷地，空气流动性不强。
Beijing is quite good because the smog is quite low, it's in a valley so there's not so much wind.
指出，隧道内无阳光照射，气温变化小，空气流动性差，阴暗潮湿的环境有利于微生物生长繁殖，并可能影响隧道内作业工人、列车司乘人员和旅客的身体健康。
In tunnel, there had no sunshine, temperature' change was small, and the mobile air was little. So the environment was suitable for the growth of bacterium. It was bad for human's heath.
指出，隧道内无阳光照射，气温变化小，空气流动性差，阴暗潮湿的环境有利于微生物生长繁殖，并可能影响隧道内作业工人、列车司乘人员和旅客的身体健康。
In tunnel, there had no sunshine, temperature' change was small, and the mobile air was little. So the environment was suitable for the growth of bacterium. It was bad for human's heath.
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