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The piano has a rich history that spans over 300 years, evolving from earlier keyboard instruments like the clavichord and harpsichord. The mod piano w invented aro 1700 b Bartolomeo Cristofori, w developed a n mechanism th made i possible f players t control the dynamics—soft and loud sounds—by varying the pressure on the keys. Later key improvements include the addition of a cast iron frame and felt-covered hammers, which allowed for greater volume and durability. These changes made the piano a central instrument in both classical and popular music.
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参考答案：ern as und y ho ew at t or o