at problem-solving than their country cousins. 拥有更加卓越的问题解决能力
In savanah country huge herds of games support prides containing 20 lions or more. 热带大草原的竞争促使鼎盛的 狮群数量达到20只 甚至更多
ancient rivers flowing across sandstone country steadily widen their canyons 古老的河流冲开岩壁 不断拓宽这些峡谷