Immigration rules restrict employment for international students in the United States.

VOA: special.2009.01.22

Okay, so in oil we all know that in the late 60s, early 70s, OPEC was formed precisely to restrict quantity among the major oil producing countries, and very quickly we see companies take other countries take advantage of this to start producing oil profitably.

众所周知在上世纪六七十年代,为了限制石油的产量,主要产油国成立了OPEC组织,但是很快就有一些国家,利用这点来产油获利

耶鲁公开课 - 博弈论课程节选

Growing fears of a flu epidemic across the Arab world is prompting Arab health ministers to restrict participation in this year's annual Hajj.

VOA: standard.2009.07.23

Mr.Obama noted that under the new law, the FDA can ban certain additives in cigarettes and restrict the marketing techniques used by tobacco companies.

VOA: standard.2009.06.22