话题——可持续发展类（城市交通）
核心词组：
private car私家车
traffic jam交通拥堵
fog and haze雾霾
hazy weather雾霾天气
energy consumption能源消耗
clean energy清洁能源
alternative energy替代能源
low-carbon technology低碳技术
health健康
green commuting绿色出行
public transportation公共交通
sustainable development可持续发展
emission of carbon碳排放
low carbon life低碳生活
carbon dioxide二氧化碳
green economy绿色经济
circular economy循环经济
effective measures有效措施
the amount of carbon emission碳排放量
long-term environmental health长期的环境卫生
short-term rapid economic development短期快速经济发展
natural resources自然资源
heavy transportation pressure沉重的交通压力
alleviate the traffic jam缓解交通压力
observe traffic regulations遵守交通规则
break traffic regulations违反交通规则
As is portrayed in this picture, two snails are climbing up a tree freely, and the higher one looking at a flow of cars being caught in a traffic jam, said to the other that “come on, see the crowded cars, they are slower than us”.
What the picture is intended to convey is thatthe swift development of private car meets with the requirements of public traffic, but also arouses the negative externality. Heavy transportation pressure in many cities may bring much inconvenience to people and exert adverse impact on the environment. On the one hand, when traffic jam happens, short distance in the past now seems to become terribly long, and drivers could do nothing but to wait. Therefore, a lot of precious time has been wasted on the road. On the other hand, exhausted gas emitted by cars has increased the burden of environment, especially air pollution. And therefore, the health impact of the pollution is becoming a bigger concern in china's smoggy capital.
Therefore, effective measures should be taken to alleviate the traffic jam. Firstly, planned development of the number of private cars should be carried out. Secondly, public transportation such as buses and subways, which are low-carbon transportation means, should be encouraged and promoted. The effective implementation of the measures must benefit the coordinated development of society and economy, environment and ecology.