它是第一个从国家科学院所确定的可持续性主要目标，即从生产力、经济效益和环境这几方面来比较有机农业和传统农业。
It is the first to compare organic and conventional agriculture across the main goals of sustainability identified by the National Academy of Sciences: productivity, economics, and environment.
多年来，中国球迷很少有机会为国家队的胜利欢呼。
For years, Chinese soccer fans have rarely had the chance to cheer for a triumph from the national team.
这些学生小时候大多没有机会到野外、野生动物保护区或国家公园旅游。
These are mostly students who had no opportunity as children to travel to wilderness areas, wildlife refuges or national parks.
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