thinking about something so much or spending so much time doing something that you do not notice other things or cannot think about other things 入神的；全神贯注的
While the government was preoccupied with the troubles on the border, rebel leaders stepped up their operations. 当政府的全部精力都用于应对边境问题时，叛乱首领们加紧了他们的活动。
Martin was too preoccupied with his own life to notice his daughter’ s problems. 马丁自己的事都忙不过来，更无暇顾及他女儿的问题了。