说明：  对于那些不是认真的钢琴演奏者，你可以通过在电脑上弹钢琴来娱乐自己。不幸的是，该版本仍然不完整，可能需要进一步开发。
(For those who are not serious piano players, you can entertain yourself by playing the piano on your computer. Unfortunately this version is still incomplete and may await further development.)