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参考答案：

People with impaired vision take 26% fewer steps per day than normal-sighted individuals and are about half as active physically, which could increase their risk of chronic illness, says a report by Maryland researchers in Archives of Ophthalmology.

im·pair/ɪmˈpeɚ/verb

im·pairs; im·paired; im·pair·ing

[+ obj] : to make (something) weaker or worse
▪ Smoking can impair your health.▪ Drinking impairs a person's ability to think clearly.

▪ His memory was so impaired by age that he often forgot where he was.

synonyms injure

— im·paired/ɪmˈpeɚd/adjective [more impaired; most impaired]

▪ The disease causes impaired vision/hearing in elderly people. — sometimes used in combination ▪ hearing-impaired people [=people with impaired hearing]