to protect, to safeguard
保护
to economize, to save, to conserve
节约
energy, energy source
能源
to hike in the mountains, to climb mountains
爬山
beneficial, useful
有益
towards, in, on, at (indicating comparison)
于
MW word for section, segment, or part
段
to push, to shove
推
air, atmosphere
空气
to recycle
回收
thick tube-shaped object
筒
to throw, to toss, to throw away
扔
bottled water
瓶装水
the earth, the globe
地球
bright, light
亮
sun
太阳
solar energy, solar power
太阳能
to use, to utilize, to take advantege of, to exploit
利用
to generate electricity
发电
country, nation
国家
to suffer from, to be troubled by, to make a noise, noisy
闹
crisis
危机
(of resources) inexhaustible
取之不尽
wind
风