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Learning without thought is labor lost; thought without learning is perilous.
学而不思则罔，思而不学则殆。
Confucius said in The Analects of Confucius :Learning without thought is labor lost; thought without learning is perilous. So when you learn knowledge,you must think about it and make practical use of it. 孔子在《论语》中说过：学而不思则罔，思而不学则殆。所以，你在学习时，要会思考，而且要学以致用。
labor lost 徒劳 perilous [ˈperələs] adj. 危险的，冒险的
Confucius [kənˈfjuːʃəs ] n. 孔子（中国古代教育家、儒家创始人）
the Analects of Confucius 《论语》 make use of sth . 利用