野牛，斑马，角马，转东非食草动物的食性角牛羚和汤氏羚这些群居动物占据了非洲东部塞伦盖蒂平原的总哺乳动物的数量的90%。
Buffalo, zebras, wildebeests, topi, and Thomson's gazelles live in huge groups that together make up some 90 percent of the total weight of mammals living on the Serengeti Plain of East Africa.
在非洲的塞伦盖蒂大草原度假时，我曾一连3小时坐在河边，看一小群角马如何鼓起勇气下河饮水。
When enjoying holidays in Serengeti Plain, I spent three hours by the riverside watching a small group of wildebeests bracing themselves for stepping into the river to drink water.
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