The water , gas, and powder of surroundings can invade into equipments so as to pollute the medium, influence the product quality, and shorten the service life of the machines .
环境中的气、水和粉尘等侵入设备会污染工作介质，影响产品质量和缩短机器寿命。
The quality of paper or other fiber materials made with wet_laid process is mainly affected by the dispersion of fibers in water or other liquid medium.
纤维在水中或其它液体介质中的分散性能是影响纸页质量或其它湿法成型纤维材料质量的主要因素。
How to select economical and practical technology to ensure drinking water quality according to local condition has become an urgent problem to be solved in small - and medium-sized cities.
如何根据实际条件，选择经济实用的技术来保障甚至提高供水水质，已经成为中小规模城市供水系统共同面临的问题。
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