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1. The cynodontidae family includes the first known mammals with teeth.
齿兽科家族包括了第一种已知的有牙齿的动物。
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2. The discovery of these fossils has led to a better understanding of the evolution of our planet's earliest life forms.
这些化石的发现有助于我们更好地理解地球最早生命形式的进化过程。
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3. The study of dinosaurs has helped us understand the diversity and complexity of ancient ecosystems.
研究恐龙有助于我们了解古代生态系统的多样性和复杂性。