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为什么骑车比跑步省力？
骑车比跑步省力，主要是因为骑车的坐姿和车轮机制减少了能量消耗、骑行时体重得到支撑以及风阻相对较小。
1、坐姿和车轮机制：骑车的坐姿可以利用骨骼和肌肉的杠杆作用，通过车轮的转动将力量高效地转化为前进的动力，减少了能量消耗。
2、体重支撑：骑车时，车座支撑了大部分体重，减少了双腿的负担，而跑步时，双腿需要支撑和移动整个体重，消耗更多能量。
3、风阻较小：骑行时，身体前倾，减小了迎风面积，相对于跑步，受到的风阻更小，因此需要更少的能量来克服空气阻力。
总结：骑车比跑步省力，主要是因为骑车的坐姿和车轮机制减少了能量消耗、骑行时体重得到支撑以及风阻相对较小。
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