Hence, the environmental equivalent of Elvis vs. the Beatles: cap-and-trade carbon emissions, or impose a carbon tax on all users?

因此，好比歌坛上的猫王和甲克虫乐队，环境上的两大方法：是“限额-交易”还是对所有人都收碳税？

youdao

It threatens to impose a cap for those universities who don't oblige.

ECONOMIST: Public-service reform

Conservative Sir Peter Bottomley was critical of the decision to impose a cap on tax relief, which he said could affect charitable donations.

BBC: MPs conclude second day of debate on 2012 Budget

Although the U.S. Congress is likely to impose a cap-and-trade system after the presidential election later this year, proposed legislation by U.S. senators Joseph Lieberman and John Warner would limit the value of foreign credits by allowing U.S. companies to use them to cover only 15% of their emissions.

FORBES: Magazine Article