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The boy and his heart had become friends, and neither was capable now of betraying the other.
Psychology is the study of how we navigate existence.
解释:药物之间有阴阳、子母、兄弟等配对关系,说明药物配伍的原理。
The world is a book, and those who do not travel read only one page.
The happiness of a married man depends on the people he has not married.