lend a hand expr.
【释义】帮助
【例句】My best friend offered to lend a hand when I move out of my apartment.
当我搬家时，我最好的朋友来帮助我了。
contribute v.
【释义】贡献，影响
【例句】Even though Sam is only 17, he has a job and contributes to his family.
尽管SAM才17岁，他已经找了工作供养家庭了。
greenhouse gases n.
【释义】温室气体
【例句】Carpooling is one way to create less greenhouse gases.
拼车是减少温室气体的好方法。
harm v.
【释义】损害，伤害
【例句】Don’t tap on the aquarium. It will harm the fish!
不要敲鱼缸，会伤害鱼！
make a difference expr.
【释义】做出改变，产生积极影响
【例句】Painting the kitchen really made a difference. It’s much brighter in there now.
粉刷厨房真的产生了很大的影响，厨房变明亮了很多！
stride n.
【释义】一小步
【例句】Jenna took strides to get rid of her debt. She cancelled credit cards, stopped eating out, and did not go shopping.
Jenna一步一步地减少自己的债务。她取消信用卡，不再外出就餐和购物。
hazardous waste n.
【释义】有毒废物
【例句】Doctors’ offices have special containers for hazardous waste.
医生办公室里有特殊垃圾箱来装有毒废物。
make a dent expr.
【释义】做出改变，产生进展
【例句】I spent all morning cleaning my room, but I barely made a dent in the mess.
我整个早上都在整理房间，但根本没什么进展。