adj. retroactive
此类有追溯效力的立法还鲜有先例。
There are few precedents for this sort of retrospective legislation.
虽然绝大多数行政规则的确关注将来的行为标准，但机关偶尔也发布作用在于有追溯效力的规则。
Although the vast majority of administrative rules do concern future standards of conduct, agencies occasionally issue rules that are intended to operate retroactively.
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