空气质量标准将进行修订

短语讲解：

1. Highways in these regions were temporarily shut down, and police urged drivers to reduce their speed in the thick fog.

shut down完全关闭，倒闭，停止运转
例句：The shop has shut down because of lack of trade.
那商店因生意萧条而停业。

2. Hundreds of flights across the country were cancelled or delayed due to low visibility.

due to由于，因为
例句：Her absence is due to illness.
她因病缺席。

3. They may have a noticeable impact on our respiratory system especially for people with chronic respiratory diseases.

have an impact on对…有影响;对…起作用,产生效果
例句：The computer has a great impact on modern life.
计算机对现代生活产生了巨大的影响。

4. Zou Ji, a professor at the Environment Institute at Renmin University says, human activity plays an important role in the continuous foggy weather.

play a role in在...起作用
例句：The headmaster plays an important role in the good running of a school.
办好一所学校, 校长起重要作用。

5. Wang Ruibin, Director of the Atmosphere Department at the China Environment Monitoring Center, says the government is considering revising the existing ambient air quality standards to cope with the changing conditions of ambient air pollution.

cope with对付;处理
例句：I was amazed at her ability to cope with the difficult situation.
她对付困境的能力使我惊讶。

6. It takes time, so the goal will be achieved step by step.

step by step一步步地, 逐步地, 逐渐地
例句：He learnt the rules of the game step by step.
他逐步学会了游戏的规则。

7. The new standard is expected to be released at the end of the year.

be expected to预计
例句：House prices are expected to perk up.
预计房价会上涨。
at the end of在…结尾,在…末端
例句：At the end of his speech, the crowd caught alight and began cheering wildly.
讲在他演讲快结束的时候, 人群情绪激昂, 狂热欢呼。