向上弯曲的尾巴，虽然是更好的方法，动物也可以弹出向下弯曲的尾巴。
Although bending the tail upwards is the better method, the animal can also be popped by bending the tail downwards.
但这项新的研究表明，有点向下弯曲的翅膀确实能从每次拍打中获得更多的空气挤压升力。
But this new study shows that wings with a little flop can actually get more air-pushing lift from each flap.
南非水牛：产于非洲的一种大而性情凶猛的水牛（非洲野牛黑牛属），有硕大的向下弯曲的双角。
Cape buffalo:a large, often fierce buffalo (Syncerus caffer) of africa, having massive downward-curving horns.
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