What mixed weather, now fine , now showery!多难捉摸的天气, 时晴时雨!Spring is showery, flowery, bowery.春天雷雨阵阵, 百花吐艳, 树荫宜人.What strange weather , now fine , now showery!天气真怪, 一会儿晴,一会儿下雨!...
The pricipal objective in designing cyclones is to create a vortex.设计旋风除尘器的主要目的在于造成涡旋运动.Middle - latitude cyclones originate at the popar front.中纬度 地区的气旋发源于极锋.For particulates, the favored devices are inertial impactors,...