但是在将近1亿年前，现代蛇类的近亲们靠着它们船桨似的尾巴在白垩纪的水流里随波起伏，拖曳着它们短小而笨拙的后腿。
But nearly 100 million years ago relatives of modern snakes undulated through Cretaceous period waters aided by a paddlelike tail and dragging a pair of short, footless hind legs.
他老跟着跑来跑去，有时还摇摇它那可爱短小的尾巴。
When I walk around he follows me. Sometimes he swings his short tail, which is very lovely.
他的尾巴大部分也都不见了，只剩下一个短小的咎，却像是始终在不停地摇呀，摇呀。
His tail has long age been lost, leaving only the smallest stub, which he would constantly jerk and twitch.
他的尾巴大部分也都不见了，只剩下一个短小的咎，却像是始终在不停地摇呀，摇呀。
His tail has long age been lost, leaving only the smallest stub, which he would constantly jerk and twitch.
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