be all attention

例句：

1. 1.She was so absorbed in her work that she didn't notice the time passing.
   她全神贯注于工作，以至于没有注意到时间流逝。
2. 2. The teacher asked us to pay full attention during the presentation.
   老师要求我们在演示期间全神贯注。
3. 3. The student focused his full attention on the task at hand.
   这位学生全神贯注于手头的任务。