VOA慢速英语2017.02.05 represent, recently, limited, numbers, 肯尼亚

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In Kenya, blind students and those with poor eyesight were still using Braille books for their studies until recently._________________________________________________________. 直到最近，肯尼亚的盲人和视力欠佳的学生还在使用盲文书籍学习。_________________________________________________________.

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