maintain (v)
/meɪnˈteɪn/
duy trì, giữ gìn
to continue to have; to keep in existence, or not allow to become less
![maintain](https://7vel.com/assets/assets-v2/img/library/maintain.jpg)
greenhouse gas (n)
/ˈɡriːn.haʊs ɡæs/
khí nhà kính
a gas that causes the greenhouse effect, especially carbon dioxide
![greenhouse gas](https://7vel.com/assets/assets-v2/img/library/greenhouse gas.jpg)
renewable (a)
/rɪˈnjuː.ə.bl̩/
có thể tái tạo
renewable energy and natural materials replace themselves by natural
![renewable](https://7vel.com/assets/assets-v2/img/library/renewable.jpg)
energy (n)
/ˈen.ə.dʒi/
năng lượng
the ability to put effort and enthusiasm into an activity, work, etc
![energy](https://7vel.com/assets/assets-v2/img/library/energy.jpg)
fuel (n)
/fjʊəl/
chất đốt, nhiên liệu
a substance that is used to provide heat or power, usually by being burned
![fuel](https://7vel.com/assets/assets-v2/img/library/fuel.jpg)
microwave (n)
/ˈmaɪ.krə.weɪv/
lò vi ba
an oven that cooks food very quickly by passing electricity through it, instead of using heat
![microwave](https://7vel.com/assets/assets-v2/img/library/microwave.jpg)
coal (n)
/kəʊl/
than đá
a hard black substance that is dug from the ground and burned as fuel to provide heat
![coal](https://7vel.com/assets/assets-v2/img/library/coal.jpg)
wind (n)
/wɪnd/
gió
a current of air moving approximately horizontally, especially one strong enough to be felt
![wind](https://7vel.com/assets/assets-v2/img/library/wind.jpg)
chimney (n)
/ˈtʃɪm.ni/
ống khói
a hollow structure that allows the smoke from a fire inside a building to escape to the air outside
![chimney](https://7vel.com/assets/assets-v2/img/library/chimney.jpg)
soybean (n)
/sɔɪbiːn/
đậu tương, đậu nành
a small bean grown originally in Asia, used as a food for people and animals
![soybean](https://7vel.com/assets/assets-v2/img/library/soybean.jpg)
![](themes/7vel/images/chan_ghichu.png)
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