“全神贯注于”常见的英文表达有：
1、 be absorbed in
例句：She was so absorbed in her book that she didn't hear the phone ring.（她全神贯注地看书，以至于没听到电话响。）
2、 be concentrated on
例句：The students are concentrated on their studies before the exam.（考试前学生们都全神贯注地学习。）
3、 be focused on
例句：He is always focused on his work and achieves great results.（他总是全神贯注于工作，取得了优异的成绩。）
4、 be engrossed in （相对更正式、书面一些）
例句：The archaeologist was engrossed in studying the ancient artifacts.（这位考古学家全神贯注地研究着那些古代文物。）