Iron rusts from disuse; water loses its purity from stagnation and in cold weather becomes frozen; and so does inaction sap the vigors of the mind. —— Leonardo da Vinqi
铁因不用而生锈；水因停滞而失纯，天冷而冻结；同样，不动会耗竭心灵的活力。—— 达·芬奇
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