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。
The dusts-removing abilities of four types of evergreen trees are ranked as: spruce, needle juniper, Sabina chinensis, and pitch pine.
多刺灌木或乔木的小科产于美国西南部。
Small family of spiny shrubs or trees of southwestern United States.
热带和亚热带的豆科的草本或灌木或乔木的小属。
Small genus of tropical and subtropical leguminous herbs or shrubs or trees.
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