会议持续了三个小时后，大家的注意力明显下降了。

After three hours of meeting, everyone was clearly ___flagging.

老师用红色标记笔把重要的段落都标了出来。

The teacher is ___flagging the important passages with a red marker.

医生提醒了我注意长期熬夜的危害。

The doctor ___flagged the dangers of staying up late regularly.