- 问题详情:Thepartsofatraditionalpianohavechangedverylittlefor___41___(hundred)ofkeysareblackandwhite___42___nowanelectronic,piano-likemusicalinstrumentreplacesthosekeyswithsurfaces___43___respondtotouch.Astart-upcompanycalledROLIbegansellingtheelectron...
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