A plane orbited over the landing field.有一架飞机在机场上空盘旋.How many spacecraft have orbited the moon?有多少艘太空船已经绕月球轨道运行过?The space shuttle orbited a communications satellite.航天飞机将一颗通讯卫星送入轨道....
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...