两千万的肉鸡之是每年在美国养的九十亿的极少的一部分。
The 20 million chickens represent a tiny fraction of the 9 billion chickens raised each year in the United States.
据信，在未来的数十年中，世界人口将增长到大约九十亿。
In the next several decades, it is believed that the world's population will increase to about nine billion people.
据估计，到2050年，地球总人口将在如今六十亿的基础上增加到九十亿。
At six billion plus today, the earth's human population will reach more than nine billion by 2050, according to estimates.
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