在生活中,我们时时感受到语言的魅力.如:小贩有趣的叫卖声等.选一个这样的事例写

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• The key on a piano corresponding to the note of freqency 880Hz is depressed very gently,so that the hammer does not strike the string,but the damper is lifted and the string is free to vibrate.When the key corresponding to the note of frequency 440Hz is struck firmly,it is found that the 880Hz string also vibrates.Give a brief explanation of this phenomenon.Suppose the 220Hz string had also been free to vibrate.What frequencies,if any,would it have em