孙辰是小学六年级的学生。她每天要坐公共汽车上学。可是，在拥挤的汽车里，她既够不着椅子把，也够不着头顶上的扶手杠，司机一刹车，孙辰就要摔倒。她便想了个招儿，拿行李带做一个简易的“把手”，两端窝成三角状，带在身上。一上车，她就请人替她在高高的扶手杠上绕两圈固? Sun Chen is a sixth-grade primary school students. She goes to school by bus every day. However, in a crowded car, she was neither enough to chair, but also headache enough on top of the bar, the driver a brake, Sun Chen will fall. She would like a trick, take the bag with a simple “handle”, both ends of the nest into a triangle, with the body. As soon as she got on the train, she asked her to take two laps for her on the high bar of the arm.