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fractionate    
vt. 分别,使分馏

分别,使分馏

fractionate
v 1: separate into constituents or fractions containing
concentrated constituents
2: obtain by a fractional process

Fractionate \Frac"tion*ate\, v. t.
To separate (a mixture of chemical substances) into different
portions or fractions, as in the distillation of liquids.
[1913 Webster]

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