最棒的办法是将一个单元重新开始学到尾，由于每一个实习都大概温习到后面实习中出现的词汇，而考试实习部分（Exam practice）会触及全部单元的词汇。本书中的学习单元是怎样构造的？
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它能有效地关闭大脑中那些习得了新技能的部分，由此使大脑不受干扰地消化吸收新的知识。
It effectively shuts down the parts of the brain that have learned new skills and allows this learning to become consolidated without interruption.
这一发现支持了200年前已被大部分学者否认的一个进化论流派：拉马克进化论。该理论认为后天习得的特征可被遗传给后代。
The findings provide support for a 200-year-old theory of evolution that has been largely dismissed: Lamarckian evolution, which states that acquired characteristics can be passed on to offspring.
绝大部分少数族裔的孩子最终都能掌握主流语言，但二语习得毕竟需要花费时间。
Most minority language children do eventually master the majority language, but second language acquisition takes time.
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