Pupils imitate the waves.

The first two sentences of the last film, one is looking up and the other is looking forward to it. With the change of visual angle, the spatial picture also changes from land to sea and from top to bottom. The last three sentences are the gradual passage of sight from near to far, which is very layered. The first sentence of "Fishing Boat Outside Qinhuangdao" responds to "You Yan" and points out the location, which is consistent with the topic.