A packed drum filter can be used for sand filtration and is a good way of providing limited quantities of safe water quickly (for example, for a health center).
充满转鼓的过滤器可以用作沙子过滤并且这是一种快速提供有限安全水量的好方法(例如，用于卫生所)。
Trailers sand television advertisements, the two most effective methods to drum up interest, are difficult marketing tools to use in China.
在中国，引发人们兴趣最有效的方式——预告片和电视广告这两种市场工具举步维艰。
The axial gap of the balancing drum and a cross channel is a cone-shaped structure with a small entrance and large exit and can prevent from being obstructed by sand flowing through the gap;
平衡鼓和交叉流道的轴向间隙为入口小、出口大的锥形 结构，防止被流经间隙的砂子阻塞；
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