The bureau will set rules for the marketplace and enforce existing laws.

VOA: special.2010.07.23

is actually looking at how to regulate greenhouse gases under existing environmental laws,

其职务是研究在现行的环境法下如何管理温室气体的排放，

全球变暖与国力 - SpeakingMax英语口语达人

The head of the government's mine safety agency acknowledged enforcement of existing laws has not been tough enough.

VOA: standard.2010.04.27

But,in 1996,the supreme court reduced the charges to criminal negligence, citing existing laws.

VOA: standard.2010.06.10

Arizona Republicans say the state needed to take action because U.S.officials have failed to enforce existing laws that could stop the flow of illegal immigrants from Mexico.

VOA: standard.2010.05.08

Instead,he pledged to boost enforcement of existing laws.

VOA: standard.2009.04.17