[ 复数 pachyderms ]
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。
Bacterial fermentation helps to break cellulose down in the digestive tract, but of pachyderms' average daily intake of 150kg or so of plant matter, about 60% passes right through.
细菌的发酵作用有助于分解消化道内的植物纤维，但由于大象平均每天要吃150公斤左右的植物，其中约有60%都是直接排出体外。
That is how a 34-year-old female Asian elephant in the Bronx Zoo showed researchers that pachyderms can recognize themselves in a mirror - complex behaviour observed in only a few other species.
这就是布朗克斯动物园中34岁的亚洲雌象“快乐”向研究者们展示厚皮类动物能在镜子中认出自己的方式。这种复杂行为仅在少数几个物种身上能观察到。
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