Learning is like rowing upstream; not to advance is to dropback. 学习如逆水行舟，不进则退 Learning without thought is useless; thought without learning is dangerous. 学而不思则罔，思而不学则殆。
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学习如逆水行舟
Learning is like rowing against the current
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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