At previous summits, the United States set forth an ambitious and still unattained goal: forging a vast, hemisphere-wide free-trade zone.

VOA: standard.2009.04.15

There's 60 people in the dorm, and I'm in the substance-free zone.

宿舍有60个人，我在无饮酒区。

布朗的宿舍公寓 - SpeakingMax英语口语达人