The content is wide, which mainly includes international environment protection treaties, national environment rules of law, standards, voluntary measurements and internal requirements.

绿色壁垒内容十分广泛，主要包括国际环保公约、国别环保法规和标准、自愿性措施及内在化要求。

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Should the IAEA's safety rules stay voluntary?

IAEA安全规则还应保持自愿性质么？

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Enterprises make applications on a voluntary basis. Certification bodies assess feeds, feed additives and their production process in accordance with relevant standards and technical rules.

企业自愿申请，认证机构对饲料和饲料添加剂产品及其生产过程按照有关标准或者技术规范要求进行合格评定。

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Consider just the following passage from chapter 30, section 21. Hobbes writes: "For the use of laws, which are but rules authorized," he says, "is not to bind the people from all voluntary actions.

请大家想想30章第21部分,霍布斯的这段话：,法律的妙用，也即那些经君主授权的规章制度的用途，不是要约束人民,做那些他们本该做的事。

耶鲁公开课 - 政治哲学导论课程节选

The implied threat is that if voluntary rules do not produce results, something stronger may follow.

ECONOMIST: Europe: All aboard | The

The planned voluntary rules would cover "integrated electronic devices, including mobile phones".

BBC: Hi-tech cars: Driver distraction warning in US

Their latest effort: Draft voluntary disclosure rules put out in late May by the College Savings Plan Network, part of the National Association of State Treasurers.

FORBES: An Expensive Education