... exploratory development 探索性研制 dust laden air 含尘空气 effective solid fire stream 有效密集消防射流 ...
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当含尘空气通过过滤器时，滤料的初始阻力随滤尘增加而逐步上升。
When air containing dust passes through the filter, the initial resistance of the filter material rises along with the increase of filter dust.
如果你的房子曾经刷过含铅的油漆，并且漆层还比较好，最好的方法是用新的不含铅的油漆覆盖旧的漆层，而不是去除老的含铅的漆层，因为这样做，铅尘反而排放到空气当中了。
If your old house has lead paint in good condition, cover it with fresh paint rather than removing it, which releases lead dust into the air.
本文以理论研究为出发点，结合实验的方法，对滤纸、清洁褶状空气滤清器以及含尘褶状空气滤清器的阻力进行深入研究。
This thesis USES theoretical approach, combining experiment method, to make an in-depth study on the pressure drop of filter-paper, clean and clogging pleated air cleaner products.
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