初学买个Electronic Keyboard就行了， 比如 Yamaha P35 这个档的：

http://bestdigitalpianoguides.com/top-5-digital-pianos-for-beginners/

http://techland.time.com/2014/01/23/the-definitive-guide-to-digital-pianos/

http://www.dawsons.co.uk/blog/best-piano-for-beginners

https://www.hoffmanacademy.com/blog/choosing-a-piano-or-keyboard-for-the-beginning-student/