法律的概念涉及主要规则和次要规则的结合。
The concept of law involves the union of primary and secondary rules.
严厉的家庭没有凶悍的奴仆,而慈爱的母亲却会有败家的儿子。
The study of psychology is the study of life's problem-solving mechanisms.
Success is not just about making money; it's about making a difference.