| 单词 | family-tree theory | 
| 释义 | family-tree theorynoun  : a theory in linguistics: at various periods branches (as Germanic) sprang from a parent language (as Indo-European) and subsequently forked into subbranches (as West Germanic, North Germanic) that later split up into the various modern languages (as English, German, Swedish)  called also pedigree theorycompare wave theory | 
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