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谁都见过蜘蛛网.诺大的一张网,密密麻麻地罩在空中.然而,只要蛛网上的一点稍受震动,每根细丝会把震动传到网络的任何一个角落.
Everyone has seen the cobweb.Now a large net, dense cover in the air.However, as long as the cobwebs a little bit by the vibration, each filament will spread the vibration to any corner of the network.