Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigour of the mind.
铁器若不常用就会生锈,水若不流动会变得污浊,冷天则会结冰;懒于思考的话,思想也会失去活力。
——Leonardo da Vinci
——莱昂纳多·达芬奇
Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigour of the mind.
铁器若不常用就会生锈,水若不流动会变得污浊,冷天则会结冰;懒于思考的话,思想也会失去活力。
——Leonardo da Vinci
——莱昂纳多·达芬奇
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