词汇和短语
Improve v. 提升
Polluted adj. 污染的
Discuss v. 讨论
Analyze v. 分析
Solution n. 解决方法
Major adj. 主要的
Serious adj. 严重的
Air pollution 空气污染
Overpopulation n. 人口过剩
Traffic n. 交通
Housing n. 住宅
Factory n. 工厂
Burn v. 燃烧
Fossil fuel n. 化石燃料
Private car 私家车
Rising adj. 上升的
Income n. 收入
Influx n. 注入
Immigrant n. 移民
Abundance n. 大量
Opportunity n. 机会
Lack n. 缺少
Affordable adj. 可负担的
Increasing adj. 上升的
Demand n. 需求
Cause n. 原因
Government n. 政府
Company n. 公司
Individual n. 个人
Bicycle n. 自行车
Limit v. 限制
License plate 车牌
Satellite n. 卫星
句子结构
…is/are a major problem.
例句：Traffic is a major problem.
Another serious problem is…
例句：Another serious problem is air pollution.
There is also the problem of…
例句：There is also the problem of overpopulation.
A major cause of… is…
例句：A major cause of air pollution is too many factories.
… is/are a major cause of…
例句：overpopulation is a major cause of traffic jam.
Another reason for… is…
例句：Another reason for overpopulation is an influx of immigrant workers.
…is because of…
例句：Traffic is because of the amount of private cars.
What … can do is …
例句：What an individual can do is choose to ride a bicycle.
By (doing) …, we would be able to …
例句：By limiting license plates, we would be able to control the traffic
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