graptolites英ɡ'ræptəʊlaɪts美ɡ'ræptəʊlaɪtsBNC⁴⁶⁹⁹⁰ 基本例句 笔石类¹⁰⁰原型graptolite的复数 During the Ordovician, most life was in the sea, so it was sea creatures such as trilobites, brachiopods and graptolites that were drastically reduced in number. 在奥陶纪，大多数生命都生活在海洋里，所以海洋生物，例如三叶虫、腕足类动物与笔石动物的数量在此时急剧减少。 yeeyan