自从Helen不幸地失明和失聪后，她学会了用手语字母表交流。
Since Helen was deaf and blind, she learned to communicate via a manual alphabet.
她还学了一种盲人用的手语字母，即用手指的不同位置代表字母表上不同的字母。
She also learned a kind of alphabet for the blind, in which different finger positions stand for different letters of the alphabet.
她还学了一种盲人用的手语字母，即用手指的不同位置代表字母表上不同的字母。
She also learned a kind of alphabet for the blind, in which different finger positions_______ ________different letters of the alphabet.
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