Scientists 科学家们
think V.认为
has been ...for 多少时间 (现在完成式)
millions of years 几百万年前
life n.生命 这边指 生物
Scientists think that there has been life on Earth for millions of years.
科学家们 认为 认为什麼呢? 关系代名词that后面 就是答案
几百万年前地球上就已经有生物存在了
Scientists think that there has been life on Earth for milli
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