题海战术则是学习高数的另一法则。秦夏说：“做练习提一方面可以巩固课堂知识，另一面可以帮助你备考。”

Another part of studying is doing a lot of exercises. "Doing exercises helps in consolidating the knowledge taught in classes and preparing for the exam, " Qin says.

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夏夷思想是从春秋、战国时期到秦统一中国的漫长的历史过程中由产生而日渐系统化的。

The thought of Xia and Yi gradually came to being and became systematic in the long history course from Spring-Autumn period and the Warring-States period to Qin-Han Dynasties.

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