在我读初三的时候，二姐对姐姐说过一句话:
When I read the third day, the second sister said a word to the elder sister
其实高中的知识跟初中的知识有些相似，只不过是把初中的概念深化了。
In fact, the knowledge of high school with some similar knowledge of junior high school, but the concept of junior high school to deepen.
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