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物理现象: 家里小孩在看电视时,吵叫着说电视机(屏幕上)的电风扇叶片快掉下来了。我走过来细加观察,只是挡在电视屏幕前的部分叶片产生晃动。见图1,图中弧线表示风扇叶片,箭号表示叶片运动方向,虚线表示电视图像(下同)。
Physical Phenomenon: When children at home watching television, they shouted that the fan blades of the television set (on the screen) were falling off. I came to observe more carefully, just block some of the leaves in front of the TV screen shaking. See Figure 1, the figure arc fan blades, arrows indicate the direction of leaf movement, dotted line shows the TV image (the same below).