名词
中文翻译：原始时代
同义词：
['primitive', 'primordial例句：1. The Prototheria era is often referred to as the age of the dinosaurs.（原始时代通常被称为恐龙时代。）']
例句：
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1. The Prototheria era is often referred to as the age of the dinosaurs.
原始时代通常被称为恐龙时代。
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2. The study of Prototheria has shed light on the origins of life on Earth.
对原始时代的研究揭示了地球上生命起源的线索。
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3. Archaeologists have unearthed numerous artifacts from the Prototheria period.
考古学家发现了大量来自原始时代的文物。