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B Flat = A sharp

E flat = D sharp

A flat = G sharp

If you know how to play A sharp, D sharp and G sharp, means that you know how to play B flat, E flat and A flat.

That's how to play A sharp, D sharp and G sharp:

B flat: A string ,first finger most near the head
E flat: A string ,fourth finger
A flat: D string ,fourth finger

下列網頁有清晰的各音位位置圖表給你參考

http://www.violin.net.cn/bbs/dispbbs.asp?boardid=49&id=9030

如果是E線的降E，就拉A線4手指(貼近D音)
降的都是下降半個位