最早的鸟类是从树上向地面滑翔的树栖生物，还是因进化出了翅膀而逐渐喜欢长距离跳跃的两足陆生动物？

Were the first flyers arboreal creatures that initially glided from tree tops to the ground? Or were they bipedal ground runners whose evolving wings allowed them to take progressively longer jumps?

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“汗血宝马”奔跑速度快，耐力强，常用作长距离的骑乘马以及跳跃和盛装舞步马，目前在国际上的售价最高可达千万美元。

"BMW blood" could run fast, strong endurance, commonly used for long-distance rides and horse-jumping moves and costumes, in the international price of up to 10 million us dollars.

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