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.
大鼠寻找平台的策略，由边缘式和随机式逐渐转变为趋向式和直线式。
The strategy of rats to find the hidden platform was changed gradually by edge type and random type to tendency type and straight line type.
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