People saw a need for free transportation, and they wanted to help control pollution.

人们看到了免费交通的必要性，他们想帮忙控制污染。

youdao

Those are the methods America has tended to use to control pollution.

这些都是美国倾向于使用的控制污染方法。

youdao

Article 34. No unit shall be permitted to transfer a production facility that causes severe pollution for use by a unit that is unable to prevent and control pollution.

第三十四条任何单位不得将产生严重污染的生产设备转移给没有污染防治能力的单位使用。

youdao

"If we don't control pollution, we're going to have serious problems, " says Li.

CNN: China's industrial growth fuels major pollution problems

Those are the methods America has tended to use to control pollution.

ECONOMIST: Climate change

Another recent innovation could also help: watershed management, which means managing water supplies across political or management borders can better control pollution and track water withdrawals.

FORBES: Spending Cuts Threaten U.S. Water Infrastructure