| 单词 | transitional fossil | 
| 释义 | transitional fossilnoun  : a fossil that exhibits characteristics of both ancestral and derived forms  During the past 30 years, new discoveries and reinvestigations of long-forgotten specimens have coalesced into a flood of transitional fossils. Paleontologists have unearthed walking whales from Pakistan, feathered dinosaurs from China …  However, although the mammal and bird origins are both documented by numerous transitional fossils, turtles appear abruptly. | 
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