There are few precedents for this sort of retrospectivelegislation.
此类有追溯效力的立法还鲜有先例。
《柯林斯英汉双解大词典》
2
The legislation was made retrospective.
该项法规具有追溯效力。
3
The excise of set-off has the retrospective effect. Whether the legislation adopts the retrospective set-off will influence the interests of parties and the nature of the set-off.