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2013-05-23 12:21
求翻译：According to demographers, the world's population didn't reach 1 billion until 1804, and it took 123 years to hit the 2 billion mark in 1927. Then the pace accelerated — 3 billion in 1959, 4 billion in 1974, 5 billion in 1987, 6 billion in 1998.是什么意思？ 待解决
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- 离问题结束还有
According to demographers, the world's population didn't reach 1 billion until 1804, and it took 123 years to hit the 2 billion mark in 1927. Then the pace accelerated — 3 billion in 1959, 4 billion in 1974, 5 billion in 1987, 6 billion in 1998.
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