【十天突破新托福ESSAYS】北美写作句型-前进类 (11/20)
hints:序号不用写~
标点符号不用写~http://t1.g.hjfile.cn/listen/201303/201303011143328279579.mp3be an essential ingredient of
sharpen one's intellect
achieve and maintain somethingbe an essential ingredient of 是...的必备条件
sharpen one's intellect 提高某人分析问题的能力
achieve and maintain something 实现并且保持某种状态
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