(单词翻译:单击)
Dinosaurs1 rapidly became extinct about 65 million years ago as part of a mass extinction2 known as the K-T event, because it is associated with a geological signature known as the K-T boundary, usually a thin band of sedimentation3 found in various parts of the world. (K is the traditional abbreviation for the Cretaceous, derived5 from the German name Kreideieit). ( TPO42, 60)
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1
dinosaurs
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| n.恐龙( dinosaur的名词复数 );守旧落伍的人,过时落后的东西 | |
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2
extinction
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| n.熄灭,消亡,消灭,灭绝,绝种 | |
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3
sedimentation
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| n.沉淀,沉积 | |
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4
derive
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| v.取得;导出;引申;来自;源自;出自 | |
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5
derived
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| vi.起源;由来;衍生;导出v.得到( derive的过去式和过去分词 );(从…中)得到获得;源于;(从…中)提取 | |
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