18．黑發(fā)不知勤學(xué)早，白首方悔讀書遲．
As young people，they usually don't know theimportanceof studying hard，however，when they are old，people begin toregret losing the reading time．

分析 importance，regret．

解答 答案：importance，regret．結(jié)合句意這里是說(shuō)不知道勤學(xué)的重要性，the是定冠詞，后加名詞importance，begin to do sth開(kāi)始做某事，結(jié)合后面的動(dòng)名詞用regret doing sth后悔做某事，故答案是importance，regret．

點(diǎn)評(píng) regret to do sth．很遺憾地/抱歉地做…（事情還沒(méi)有做） 
I regret to tell you that you can't pass the examination．我很遺憾地通知你你不能通過(guò)這次考試． 
regret doing sth．很遺憾/后悔做了…（為已經(jīng)做過(guò)的事而感到…） 
I regret disturbing yo so long．我很抱歉打擾了你那么久

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