Four evergreen shrubs stood at each corner , where they struggled to survive the dust and fumes from a busy road 四丛常绿灌木分别位于每个角落，它们忍受着从繁忙大街上吹来的尘烟挣扎着活下去。
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By utilizing mechanical vibration , the problem of protecting heat - pipe exchanger against smoke dust adhesion is solved . an inertia vibration is successfully used as an exciting source in dust removal process 摘要本文应用振动的方法，解决了长期来防碍热管换热器的含尘烟气馀热中应用的难题。
