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sth. that stays the same even though other things changec--------------------

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clearly different or separated------------------

be the only one of its kindu------------------

vt. to make sb. feel that they are in a different place, time or situationt-------------------------

糖苷是单糖的半缩醛上与非糖物质缩合形成的化合物,其非糖部分称为______。