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	knowledgment know-little known known man know no bounds know-nothing know-nothingism know-nothingness know-not-what known quantity know one's onions know one's own mind know one's way around (or about) knowpert know someone by sight know someone in the biblical sense know something backwards know something for a fact know something inside out know something like the back of one's hand know the ropes know the score know what one is about know what one is talking about know what one likes

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