2 sentences

1. 他在全神贯注地工作。

   tā zài quán​shén​guàn​zhù de gōng​zuò.

   He is working with total concentration.

   Source: Dong Chinese Dictionary

2. 乐师正全神贯注地拨动着瑟的琴弦。

   yuè​shī zhèng quán​shén​guàn​zhù de bō​dòng zhe sè de qín​xián.

   The musician is concentrating on plucking the strings of the se.

   Source: Dong Chinese Dictionary