是“所有现代恒温动物的腿都是长在身体下部的，而恐龙的腿也具有同样的特点”吗？不是的，腿长在身体下部是恒温动物的“必要不充分条件”。
When dinosaurs lived, even the Polar Regions, where dinosaur fossils have been found, were much warmer than today, warm enough during part of the year for animals that were not endotherms to live.
是“所有现代恒温动物的腿都是长在身体下部的，而恐龙的腿也具有同样的特点”吗？不是的，腿长在身体下部是恒温动物的“必要不充分条件”。
When dinosaurs lived, even the Polar Regions, where dinosaur fossils have been found, were much warmer than today, warm enough during part of the year for animals that were not endotherms to live.
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