principal branch meaning in Chinese

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For many purposes a particular branch is required . this is called the principal branch and the values for this branch are called principal values
应用中多数场合需要一个特定的函数.这个特定的函数被称为主函数,主函数的值被称为主值
As one of the principal branches of learning strategies , cognitive strategies have direct relations with the process of learning , especially in recent years , with the development of education , cognitive strategies are being employed in middle school as a good method of learning english for the students
学习策略在近二、三十年来一直被许多学者所关注，认知策略作为学习策略的一个重要部分，是直接与学习过程有关系的。尤其近年来，随着教育的不断深化，在中学教育中，认知策略已经作为中学生学习英语的方法之一而得到运用。