N any very large thick-skinned mammal, such as an elephant, rhinoceros, or hippopotamus 大型厚皮动物; 如大象、朝天犀牛或河马
The pachyderms were paired up. Only if they pulled together could they get the food.
大象们被配好对，只有它们同时拉绳子才能获得食物。
More surprising is that pachyderms' front and rear legs are equal footing when it comes to acceleration and braking.
更令人吃惊的是，这种厚皮动物的前肢和后肢在加速和刹停功能上起着相同作用。
Surplus pachyderms impose a particular burden on the poor, trashing their crops and attacking water sources, children and old people.
大象过剩对生活贫困的人们构成了额外的负担，他们与人类争抢水源，袭击老人和儿童。
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