单词	serration
释义	serration /sɛˈreɪʃn / noun (usually serrations) A tooth or point of a serrated edge or surface: a heavy-duty knife with sawtooth serrations... Its teeth lacked the usual serrations along the edges found in other two-legged carnivorous dinosaurs. Nor did the ancient crocodiles have tooth serrations of correct size and spacing to have made drag marks observed on some of the best-preserved bones. It may not be so clear in this particular fossil but those serrations are teeth!
随便看	radial-ply radial saw radial sawed radial sawn radial sector radial shield radial symmetry radial vein radial velocity radian radiance radiancy radiant radiant efficiency radiant energy radiant flux electrology electroluminescence electroluminescent electrolysable electrolysation electrolyse electrolyser electrolysis electrolyte

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