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他曾应邀参加了国内外42个眼科学术会议。
He was invited to attend around 42 national and international congress and conferences on ophthalmology.
youdao
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他曾应邀参加了国内外42个眼科学术会议。
He was invited to attend around 42 national and international congress and conferences on ophthalmology.
youdao