delve in(或into)

• 发掘；探索，探究，深入调查(研究)，钻研(书本、历史等)：

  to delve into the background of a case

  详细调查一桩案件的背景

  The scholar delved into lots of old books and papers for the facts.

  这位学者钻在故纸堆里寻找资料。

  He had a considerable Elizabethan library to delve in.

  他拥有相当多的伊丽莎白时期的藏书供其钻研。