根据所学内容，论述正式规则与非正式规则的区别与联系。
Grounded on what you have learned, explain the similarity and distinction between formal regulations and informal regulations.
职业资格证书制度是由一系列正式和非正式规则构成的系统。
The NVQ structure is a systematic one made up of a series of formal and informal rules or constrains.
商业道德、习俗等非正式规则的形成，不是由于法律的强制，而是社会规则的自然演化。
The formation of the informal rules such as commercial moral and conventions doesn't obliged by law, but evolves by nature.
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