The process for controlling the major non-point source pollution in Huangpu River environment was provided in a comprehensive way, including principles and technical methodologies.

介绍了开展黄浦江水环境综合整治中主要面源污染控制研究的过程、内容、方法和原则；

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Strong noise pollution had been controled for noise source equipments including mainly 18 fans in Qingdao factory of traditional Chinese medicine, the major step is concentrated control of fan group.

对青岛中药厂以18台风机为主的噪声源设备造成的强噪声污染进行了综合治理，重点措施是风机机群的集中控制。

youdao

Vitamin D is a fat-soluble vitamin that occurs naturally in a limited number of foods, so fortified foods including milk, margarines and breakfast cereals and dietary supplements are the major source for most Americans.

CNN: How much vitamin D should someone over 55 take?