Hart interpret the concept of law by the theory of social rules, thus rules are different from customs; and law is the combination of primary rules and secondary rules.

哈特以社会规则理论为核心阐释法律的概念，使规则区别于习惯，并将法律视为初级规则与次级规则的结合。

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Vocal music teaching of secondary vocational schools is an organic part of music education system of secondary vocational schools in our country, which has its own rules and characteristics.

中等职业学校声乐教学是我国中等职业学校音乐教育体系中的一个有机组成部分，有其自身的规律和特点。

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The practices proves that Abiding by parameterized rules to conduct secondary development contributes to improve software design efficiency and reduces repeated work with maximum limit.

实践证明，遵从参数化原则进行二次开发工作，有助于提高软件设计效率，并最大限度地减少重复工作。

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The law is not expected to take effect until 2014, since the Mexican Federal Congress will need to draw up secondary legislation to implement the new rules.

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The BBC's political correspondent Carole Walker said Ms Blears, Mr Hoon and Mr Purnell all appeared to have complied with the same rules which state MPs can nominate a secondary residence for capital gains purposes - and that this does not have to be the same as the designated second home on which MPs draw expenses.

BBC: 'Duck island' claim MP to retire

Due to strict rules entitling consumers to financial privacy, though, banks are limited in the secondary use of that data.

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