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.
北方温带柏科常绿针叶树，深色鳞状树叶，圆形球果。
Cupressus of north temperate regions having dark scalelike leaves and rounded cones.
圣诞树一般是的用杉柏之类哒常绿树做成，象征生命长存。
Christmas tree in general is sort of evergreen fir bo made a symbol of life forever.
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