为什么400米的田径场,弯道要比直道要长?
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![为什么400米的田径场,弯道要比直道要长?](/uploads/image/z/2520425-65-5.jpg?t=%E4%B8%BA%E4%BB%80%E4%B9%88400%E7%B1%B3%E7%9A%84%E7%94%B0%E5%BE%84%E5%9C%BA%2C%E5%BC%AF%E9%81%93%E8%A6%81%E6%AF%94%E7%9B%B4%E9%81%93%E8%A6%81%E9%95%BF%3F)
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