科学家先前在探寻为何特定的现存哺乳动物族群会拥有相对大的脑时，多借助于研究关系较为疏远的现存哺乳动物。
Previous research which has looked at why certain groups of living mammals have bigger brains has relied on studies of distantly-related living mammals.
前年，受国家地理杂志的委派，我在太平洋热带地区与现存的最大的一个蓝鲸族群共渡了一个月的时光(参见《国家地理》2009年三月号文章《StillBlue》)。
The year before, on assignment for this magazine, I had spent a month in the tropical Pacific with the largest remnant population of blue whales (see "Still blue," March 2009).
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