全部

1·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。

2·The concentrations of N and S in Sabina chinensis leaf were higher along urban trunk roads and belt highway than at reference site, while those along suburban roads were similar to the reference.

城市干线和绕城公路蜀桧叶片中的N和S含量高于对照点，而城郊公路则接近对照。