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graptolites [ɡ'ræptoʊlaɪts]

释义 笔石类;

例句:

  • Material illustrating detailed structure of graptolites has been etched from limestone by means of hydrofluoric acid.
    表明笔石详细构造的物质是利用氢氟酸从石灰岩中侵蚀出来.