In a review study published in 2007 in the journal Ibis, researchers looked through European and North American bird journals and other references dating back to the late 19th century.
在2007年《朱鹭》杂志发表的回顾性研究中，研究人员查阅了回溯到19世纪后期的欧洲和北美洲鸟类期刊和其他的参考文献。
Should Barack Obama win, he is expected to call for a review of the North American Free Trade Agreement, on which Canada depends.
如果奥巴马获胜的话，他将重新审视北美自由贸易协定，而该协定对于加拿大来说不能一日或缺。
He said Mr Obama had not proposed renegotiating the North American Free-Trade Agreement but wanted to review Labour and environmental standards in the accord.
他表示奥巴马并无提议重新磋商北美自由贸易协定，但希望审阅与此相关的劳动力和环境标准。
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