保护
bǎohù
To protect to safeguard
节约
jiéyuē
To economize; to save; to conserve
能源
néngyuán
Energy; energy source
爬山
páshān
To hike in the mountains; to climb mountains
有益
yǒuyì
Beneficial; useful
于
yú
Towards; in; at; on; [indicating comparison]
段
duàn
[Measure word for section, segment, or part]
推
tuī
To push; to shove
空气
kōngqì
Air; atmosphere