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.
莫福德教授说，手语使用者就像是那些第一语言字母表和英语不同的英语学习者。
Professor Morford says signers are like English learners whose first language uses a different 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.
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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