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减震问题: 弹簧钢板加直立弹簧组成的减震器装置示意图。 19世纪初的四轮轻便马车。弯曲的长木制成的弹簧可以使行驶更平稳。
Vibration reduction: A schematic diagram of a shock absorber device consisting of a spring steel plate and an upright spring. A four-wheeled buggy early in the 19th century. Curved long wooden springs make the ride smoother.