science

(a)  

excessive, over

(a)  

awareness,consciousness

(a)  

in advance, ahead of time

(a)  

wall

(a)  

to hold (an event)/to organize

(a)  

responsibility, duty

(a)  

marks that this is a person who does something

(a)  

interview, to interview

(a)  

to log in, sign in

(a)  

information， news

(a)  

to ask for or inquire about

(a)  

to join, to become a member of

(a)  

a volunteer

(a)  

earth, planet

(a)  

speech, lecture

(a)  

to sweep, to clean

(a)  

garbage， waste

(a)  

to be sure, to make certain, definite, certain

(a)  

group, organization

(a)  

goal, target

(a)  

to provide, to offer

(a)  

customer

(a)  

to try as much as possible, endeavor

(a)  

to invent, invention

(a)  

oil

(a)  

stomach

(a)  

large amount, large quantity

(a)  

to occupy, to take up

(a)  

according to statistics

(a)  

burden, responsibility

(a)  

plastic

(a)  

situation, circumstances

(a)  

waste, useless

(a)  

device, equipment

(a)  

old, used (of things)

(a)  

government

(a)  

to deal with, handle

(a)  

resource, source

(a)  

to lack, a shortage

(a)  

factory， plant

(a)  

pollution, to pollute

(a)  

to purify, to cleanse

(a)  

to leak, to drip

(a)  

to repair, to fix

(a)  

to water flowers

(a)  

to save, conserve

(a)  

education, teach

(a)  

to dilute, to weaken, to play down

(a)  

to plant, to grow

(a)  

to control

(a)  

river

(a)  

to resolve, to solve

(a)  

enough, sufficient

(a)  

statistics, data

(a)  

reason, cause

(a)  

despite, although, even though (slightly more dramatic/aggressive than 虽然）

(a)  

to receive, accept

(a)  

as well as, along with

(a)  

box, container

(a)