Both services are perennially short of staff.两个机构一直都是人手不够。We want to know what is perennially new about the world.我们想知道世上什么东西永远是新的.A fighter is perennially young.战士是永远年轻的....
The dedusting efficiency of the electrostatic dust precipitator was enhanced after reform.改造后,电除尘器除尘效率提高.Combustion itself is key to smoke abatement and dedusting.认为消烟除尘必须从燃烧本身入手.Therefore, China has a huge potential mar...