How did you come by that scar on your forearm?
你臂上的伤疤是怎样来的?
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The oldest known turtle ancestor, a creature called Eunotosaurus africanus, lived 260 million years ago and looked almost nothing like a modern turtle, but it had a set of broad, flat ribs that anchored the muscles of its powerful forearms.
已知的最古老的龟祖先,是一种叫做非洲正南龟的生物,它生活在 2.6 亿年前,看上去几乎不像现代龟,但它有一组固

大前臂肌肉的宽而扁平的肋骨。