热带地区繁衍着比北极地带多上数十倍的动植物物种，地理位置越趋向两极，生物的物种就会有直线的减少趋势。
The tropics boast more than 10 times as many species of animal and plant as the Arctic, with diversity decreasing steadily as you approach the poles.
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).
第二个问题有关热带雨林的地理位置。
The second question concerned the geographical location of rainforests.
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