Buried himself in his study, he didn‘t know that the others

由于他埋头苦学,以至于别人都走掉了他也不知道.
bury是动词原形 埋藏 的意思 buried是动词过去分词做状语 表原因
过去分词短语作状语,可表示时间,原因,条件等,可发展为一个状语从句.过去分词作状语可分为：
一般式 (done)
表示分词动作与谓语动作同时发生或分词动作发生于谓语动作之前.
完成式（having been done)
强调分词动作发生在谓语动作之前.例如Scolded (As she was scolded) by the teacher,the girl sat there without lifting her head
这个女孩由于被老师批评了 她坐在那儿垂着丧气的
Frightened (=Because / As she was frightened) by the tiger,the girl didn't dare to sleep alone
由于这个女孩很害怕老虎,所以她不敢单独一个人睡觉