名词
中文翻译：原始热兽
同义词：
['primitive', 'ancestral']
例句：
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1.The discovery of the prototherian fossils in the cave has sparked a new wave of research.
在洞穴中发现的原始热兽化石引发了新一轮的研究热潮。
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2. The prototherian species is believed to have existed on Earth for millions of years.
据信，这种原始热兽物种已经在地球上存在了数百万年。
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3.The prototherian had a unique adaptation that allowed it to survive in extreme environments.
这种原始热兽具有独特的适应性，使其能够在极端环境中生存。