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1. The HsuchuangianStage is a crucial period in the historyof human evolution.
海桑安阶段是人类进化史上一个至关重要的时期。
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2. The discovery ofthis stage has revolutionized our understanding ofthe origins of life on Earth.
这一阶段的发现已经彻底改变了我们对地球生命起源的理解。
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3. The HsuchuangianStage was characterized by rapid changes in climateand ecosystems.
海桑安阶段以气候和生态系统的迅速变化为特征。