过去分词作状语的具体用法

Earth Day, marked on 22 April, is an annual event aiming to raise public awareness about environmental protection.

想问一下这句话中过去分词作状语的用法。marked on 22 April是独立成分（插入语）吗？几种主要的原因状语、让步状语、条件状语之类的好像都对不上。

Earth Day, marked on 22 April, is an annual event aiming to raise public awareness about environmental protection.

过去分词短语 marked on 22 April，在本句作Earth Day的定语，非限制性定语，相当于一个非限制性定语从句。不是状语。等于:

Earth Day, which is marked on 22 April, is an annual event aiming to raise public awareness about environmental protection.

刘永科 - 教育出版集团英语总顾问 & 英语系列图书主编

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