他说，根据估计，大笑作为人类的一种能力，已经有四百万年的历史了。
He says that by some estimates, laughter is a human ability that is about four million years old.
他说，根据初步的估计，返回缓冲区的村民需要得到重新恢复和重建的援助，因为他们的住房有许多已经被烧毁或者遭到破坏。
Based on first assessments, he says returnees to the villages in the buffer zone need rehabilitation and reconstruction assistance as many of their homes have been burned down or otherwise damaged.
古尔德告诫说，他的团队只是根据有限的数据所做出的“非常粗略”的估计，并很有可能在未来几年内随着其他恒星星系被发现而被改写。
Gould cautioned that his team's "very rough" estimate is based on limited data and is likely to change as other star systems are spotted in the coming years.
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