C (樹木) 树木 shu4mu4
(collective term for) trees
Baum-,Bäume (Sammelbegriff)
D (綠化) 绿化 lv4hua4
make (a place )green by planting trees
aufforsten, Grünanlagen pflanzen
綠 绿 green / chlorine
化 化 change, convert, reform / -ize