白垩纪 (Bái è jì) — 白亜紀(地質時代、約1億4500万~6600万年前)
定義
noun
白亜紀(地質時代、約1億4500万~6600万年前)
例文
- 白垩纪。Kǒng lóng zài Bái è jì mò qī miè jué le.Dinosaurs went extinct at the end of the Cretaceous period.
- 白垩纪。Bái è jì De dì céng zhōng hán yǒu dà liàng shí huī yán.The strata of the Cretaceous period contain large amounts of limestone.
- 白垩纪。Kē xué jiā zài Bái è jì yán shí zhōng fā xiàn le xīn de huà shí.Scientists discovered new fossils in Cretaceous rocks.
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