常见例句用作名詞 (n.)This was the result from the large-scale regression in the Late Ordovician.這是奧陶紀晚期大槼模海退的結果。Major hydrocarbon source rocks are in the Cambrian and Ordovician.寒武-奧陶系烴源巖是該區主力烴源巖; 返回 Ordovician