Previously I lived in Tin Shui Wai. No vomitting occured when travelling long distance by bus everyday. But recently, I feel very uncomfortable when travelling even a short distance by bus. Then I discover a method to relieve such feeling. That is to put my head on the back of the seat and my kneel against the back of the seat at my front. So 兩邊頂住, and my body doesn't move as the bus moves. In this way, I feel better.