Bilateral animals flourished in the Cambrian so tracing their origins is crucial to understanding the pace of animal evolution.
两侧对称动物在寒武纪繁衍旺盛，因此追踪它们的起源对了解动物是如何进化而来的十分重要。
The origin of the vertebrates is one of the most important transitions in animal evolution.
脊椎动物的出现是动物 进化历史上一次质的 飞跃。
The results indicated that Macrostomum tuba is an ideal experimental material for the study of animal evolution.
研究结果提示：大口涡虫是涡虫纲教学和动物进化研究的理想实验材料。
Amphioxus has a special evolutionary status in traditional classification and is important to the study of animal evolution.
文昌鱼的传统分类地位比较特殊，在生物进化中占有重要的地位。
Their affinities are still unclear, but they may provide a critical new dimension to the record of the initial phase of animal evolution and biomineralization.
这些化石的亲缘关系仍不清楚，但它们为我们提供了动物演化和矿化初始阶段的化石记录。
Their affinities are still unclear, but they may provide a critical new dimension to the record of the initial phase of animal evolution and biomineralization.
这些化石的亲缘关系仍不清楚，但它们为我们提供了动物演化和矿化初始阶段的化石记录。
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