用英语解答鸟为什么会飞
Birds fly due to their specialized anatomy and physiology. They have lightweight bones, often hollow, which reduce their body weight. Their wings are large and adapted for flight, with a high aspect ratio, allowing them to create lift. Their muscles, particularly the pectoral muscles, are strong and well-suited for flapping. Their respiratory system is efficient, enabling rapid oxygen intake, crucial for flight. Additionally, birds have a keel on their sternum, which supports their flight muscles. Their hearts are also highly efficient, pumping blood rich in oxygen to their muscles. These adaptations, combined with their instincts, enable birds to take to the skies.
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