| contribute | 为...做出贡献，是...的原因 |
| generation | all the people who were born at about the same time |
| vehicle | a machine such as a car, bus, or truck which has an engine and is used to carry people from place to place. |
| source | 来源；出处
a place, person or thing that you get sth from |
| pollute | make it dirty and dangerous to live in or to use |
| volcano | 火山 |
| effect | 效应；影响；结果
a change that sb/sth causes in sb/sth else; a result |
| resident | a person who lives in a particular place or who has their home there |
| result | 结果/成绩 |
| suburb | an area where people live that is outside the centre of a city |
| previous | happening or existing before |
| connect | to join together two or more things; |
| colleague | people who work with you |
| attack | using violence to try to hurt or kill sb/strong criticism of sb/sth in speech or in writing |
| research | to study somethig carefully |
| increasingly | more and more all the time |
| applied science | 应用科学 |
| decrease | to become or make sth become smaller in size, number |
| shortage | there is not enough of something or people |
| prominent | 重要的；著名的；杰出的
important or well known |
| value | consider important/ |
| society | people in general, living together in communities社会 |
| trust/distrust | the belief that sb/sth is good, sincere, honest, etc. and will not try to harm or trick you 信赖信任 |
| encourage | to give sb support, courage or hope |
