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Today people usually acquire a large amount of botanical knowledge from textbooks.
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According to Dr.Oberdor, this device can lead the blind people to the exact place
Thick clouds obscured the stars from view.
The number of right-handed mothers who hold the baby on the left side exceeds that of left-handed ones by 22％.
Dr. Smith hopes to make this device smaller so as to help the blind navigate unfamiliar places:
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