arrange (a group of people or things) in classes or categories according to shared qualities or characteristics
把… 分类
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mountain peaks are classified according to their shape .山峰是根据形状来分类的。
assign (someone or something) to a particular class or category
将… 归入一类(或一个级别)
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elements are usually classified as metals or non-metals .化学元素通常归为金属元素或非金属元素。
designate (documents or information) as officially secret or to which only authorized people may have access
将(文件,公文,情报)定为机密
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government officials classified 6.3 million documents in 1992 . 1992年政府官员将630万份文件定为机密档案。
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