知识源于实践。
知识和才能来源于实践。
最重要的是知识来源于实践。
A most important thing is that knowledge comes from practice.
当我还是个孩子的时候，就听说过知识来源于实践。
When still a child, I was told that knowledge comes from practice.
当我还是个孩子的时候，就听说过知识来源于实践。
When still a child, I was told that knowledge comes from practice.
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