The earth is about 4600 million years old,这句就完了请加句号.
地球已存在大约46亿年了.
modern man has lived on the earth for only 3500 years,but during that time
现代人类（区别于原始人）在地球上仅仅出现了3500年,但就在这短短的时间里,……
英语翻译The earth is about 4600 million years old,modern man has
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