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1.Dinoflagellates are a type of phylum in the kingdom of protists.
古生代的浮游生物是原生动物界的一种类型。
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2.The dinoflagellates were once abundant in the oceans, but their populations have declined significantly over the past century.
古生代的浮游生物曾经在海洋中非常丰富，但在过去的一个世纪里，它们的种群数量已经显著下降。
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3.Scientists are studying dinoflagellates to understand how they adapt to changing environments and climate conditions.
科学家们正在研究古生代的浮游生物，以了解它们如何适应不断变化的环境条件。