No one realized at the time that his struggles in school were due to the reading disability, dyslexia.
那时没有人意识到他在学校的艰难是因为他的阅读障碍。
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It's also useful for people with reading disabilities.
它对阅读障碍者也很有用。
英语百科
Reading disability
A reading disability is a condition in which a sufferer displays difficulty reading resulting primarily from neurological factors. Developmental Dyslexia, Alexia (acquired dyslexia), and Hyperlexia.