天空被雨水冲刷得一尘不染，犹如一面明镜，散发着迷人的宝石蓝。
The sky is rain wash clean, is like a mirror, sending out charming sapphire blue.
根据流体力学射流理论，分析了空气幕在综采工作面隔离粉尘的作用，并根据综采工作面应用空气幕隔尘的特点，设计了空气幕。
An air curtain was designed according to the jet theory of fluid mechanics and the role and feature of air curtain to separate dust in a fully mechanized face.
研究以野外观测为主要手段，分析了不同高度大气降尘与不同下垫面沙粒的粒度特征及二者间的关系。
The grain characteristic of falling dust and different height surface and their relationship were analyzed by the field observation data.
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