After the formation of the biosphere, about 300 million years ago, humans began to appear, marking the Earth entered a new stage.
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humans began to appear
人类开始出现
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In the Thirteenth Century the first mechanical clocks began to appear across Europe, a Medieval innovation that would revolutionise how humans saw time.
FORBES: What Are Examples of Things in the "Common Knowledge" about History That Historians Almost Universally Consider Incorrect?
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