On April 10, a video clip (视频片段) drew public anger on the internet. In the video, airport police violently dragged (拉) a 69-year-old Asian man off a United Airlines flight. The man called David Dao is a doctor. When he was asked to give his seat to the airline staff, he refused and was treated like that. The airline company said sorry for the accident. But its attitude (态度) made people even angrier.