The good news is that California's San Joaquin Valley, the other region to fall under the Five Percent Plan because of particulate matter, has shown that dust-reduction measures can work.
好消息说加利福尼亚州圣约魁谷周边地区之前由于空气微粒问题被列入百分五计划，目前已显示防尘方案是有效的。
Solid particulate conveying characteristic is given by backwards leakage flow rate through intermeshing region and formulated as a conveying efficiency d.
粒子的固体输送特性，在啮合段形成的返向漏流速率是依靠螺杆的设计参数和质量密度。
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