contamination (n)
 /kənˈtæm.ɪ.neɪt.ʃən/

sự ô nhiễm

the process of making something dirty, polluted, or poisonous by adding achemical, waste, or infection

reservoir (n)
/ˈrez·ərˌvwɑr/

kho dự trữ

a large amount of something that is available to be used

blend (n)
/blend/

hỗn hợp

a mixture of different types of the same thing

engine (n)
/ˈɛndʒən/

động cơ

a machine with moving parts that uses a fuel to produce movement

biodiesel (n)
/ˈbaɪ.oʊˌdiː.zəl/

dầu diesel sinh học

fuel made from vegetable oils or animal fat

dispose of (phrasal verb)
/dɪˈspoʊz əv/

bỏ đi, ném đi

to get rid of something; throw out or destroy

witness (v)
/ˈwɪt·nəs/

chứng kiến

to see something happen

extinction (n)
/ɪkˈstɪŋkʃn/

sự tuyệt chủng, sự biến mất

a situation in which a plant, an animal, a way of life, etc. stops existing

shrink (v)
/ʃrɪŋk/

co lại, giảm xuống

to become smaller or cause something to become smaller

elementally (r)
/ˌel·əˈmen·təl.li/

về cơ bản

fundamentally or essentially

emission (n)
/iˈmɪʃ·ən/

chất thải

gas, etc. that is sent out into the air

modification (n)
/ˌmɑː.dɪ.fɪˈkeɪ.ʃən/ 

sự sửa đổi, sự biến đổi

the process of changing something slightly

constraint (n)
/kənˈstreɪnt/

sự ràng buộc, sự hạn chế

something that limits the range of a person’s actions or freedom

underground (a)
/ˌʌn·dərˈɡrɑʊnd/

dưới mặt đất, ngầm

below the surface of the earth; below ground

stable (a)
/ˈsteɪ·bəl/

bền vững, vững chắc, ổn định

firmly fixed or not likely to move or change

deplete (v)
/dɪˈplit/

làm cạn kiệt

to reduce something in size or amount, especially supplies of energy, money, etc.

petroleum (n)
/pəˈtroʊ.li.əm/

dầu mỏ

oil that is found under the ground or the ocean and is used to produce gasoline, paraffin, diesel oil, etc.

consumption (n)
/kənˈsʌmp·ʃən/

sự tiêu thụ

the use of something such as fuel or energy, or the amount that people use

reserve (n)
/rɪˈzɜrv/

nguồn dự trữ

something kept for a particular purpose or time, or the state of being kept for future use by someone

crude oil (n)
/krud ˈɔɪl/

dầu thô

oil from underground that has not yet been made into other products