琴罩有必要吗？

我现在怀疑那种大大的丝绒琴罩有必要每时每刻都伴着钢琴吗?会不会反而有副作用？比如潮气积在里面散发不出等。。。
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需要的时候再买吧，比如经常有长时间不弹的时候
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A piano cover is very helpful for five reasons: 1. It keeps kids and itinerate jerks from pounding on the piano. 2. It keeps dirt out of the piano. 3. It prevents random nicks and scratches. 4. A piano cover keeps a more controlled environment for the piano during weather changes. 5. A piano cover tells visiting musicians that you take care of your instrument.

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