It takes great efforts for children to grasp the concept of number words.
儿童掌握数字词汇的概念需要付出很大的努力。
The Great Wall is symbolic of such defensive concept.
万里长城所象征的就是这种防御观念。
The Great Wall is symbolic of such a defensive concept.
万里长城所象征的就是这种防御观念。
The concept of individual freedom has had no importance in these great majorities of cultures in human history.
在人类历史的大多数文化中,个人自由这个理念显得无足轻重
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