Chang认为振动语言可以以同样的道理取代文字：有时人们想交流一些事情而不愿周围的人知道他们在说什么。她说：想像一下当你完成一笔交易时还可和别人握手。[理工类C]

　　13 Wonder Webs

　　Spider webs are more than homes, and they are ingenious traps. And the worlds best web spinner may be the Goldern Orb Weaver spider. The female Orb Weaver spins a web of fibers thin enough to be invisible to insect prey, yet tough enough to snare a flying bird without breaking.

　　The secret of the webs strength? A type of super-resilient silk called dragline. When the female spider is ready to weave the webs spokes and frame, she uses her legs to draw the airy thread out through a hollow nozzle in her belly. Dragline is not sticky, so the spider can race back and forth along it to spin the webs trademark spiral.

　　Unlike some spiders that weave a new web every day, a Goldern Orb Weaver reuses her handiwork until it falls apart, sometimes not for two years. The silky thread is five times stronger than steel by weight and absorbs the force of an impact three times better than Kevlar, a high-strength human-made material used in bullet-proof vests. And thanks to its high tensile strength, or the ability to resist breaking under the pulling force called tension, a single strand can stretch up to 40 percent longer than its original length and snap back as well as well as new. No human-made fiber even comes close.

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