| 单词 | 一项法规 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔grandfather clause〕A provision in a statute that exempts those already involved in a regulated activity or business from the new regulations established by the statute.不溯既往条款：一项法规条款，对法规所定新规则所涉及的业已存在的活动或事务免予追究美国传统 |
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