Huánán de shān shàng dàduō shì chánglǜ kuòyèlín, yìnián-sìjì dōu shì lǜ de.
The hills of South China are mostly covered in evergreen broadleaf forest that stays green all year round.
Tips
usage
常绿 is the botanical word, as in 常绿植物 evergreen plants; its opposite is 落叶, deciduous. 常青 means the same but also works figuratively: a 常青树 is a perennial favourite, never a 常绿 one.