So global growth will ease—which, after five years at an average of almost 5%, close to its fastest pace ever, it needs to do.

所以，在经历了5年年均5%——接近历史最高水平——的增长之后，全球经济增长将会降温，这也是必须的。

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Using the new Chandra data, the age of N49 is thought to be about 5, 000 years and the energy of the explosion is estimated to be about twice that of an average supernova.

采用钱德拉新数据，估计N49的年龄约为5千年，其爆炸的威力大约是一般超新星爆炸的两倍。

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However, while the average global fertility has dropped from about 5 to 2.6 births per woman during the past 50 years, considerable uncertainty exists about the future.

然而，虽然过去50年中，全球平均出生率从每个妇女生5个孩子下降到2.6个，未来仍具有巨大的不确定性。

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