Unlike visible light waves, these radio waves can get through the various gases and dusts in space, and through our own earth's atmosphere comparatively easily.
与可见光波不同的是，这些无线电波可以较容易地穿过太空中的各种气体和灰尘，穿过我们地球的大气层。
2
The dusts-removing abilities of four types of evergreen trees are ranked as: spruce, needle juniper, Sabina chinensis, and pitch pine.
四种常绿乔木的除尘能力等级排列为：云杉，针刺杜松，圆柏和柏油松。
3
occupational dusts and chemicals (vapors, irritants, and fumes);