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两本交叠的书之间能产生很大的摩擦力,我们通过反复实验剔除重力的影响,找到了产生摩擦力的主要因素是纸张的回复力。
Two overlapping books can produce a great deal of friction, we repeated experiments to eliminate the influence of gravity, find the main factor of friction is the paper’s resilience.