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一天,我发现一只蜘蛛在我家阳台的纱窗上,几只苍蝇在它周围飞来飞去,还不时地用身体碰它,但蜘蛛却纹丝不动。咦!这是怎
One day I found a spider on the window screen of my balcony, a few flies flying around it, and from time to time touching it with my body, but the spider was motionless. How is this?