An important archaeological discovery on the island of Efate in the Pacific archipelago of Vanuatu has revealed traces of an ancient seafaring people, the distant ancestors of todays Polynesians.
2
第四纪的凉爽气温或许让我们的大脑比人类远祖的大脑更大。
The cool temperatures of the Quaternary may have allowed our brains to become much larger than those of our of hominid ancestors.
3
采用这些数据，我们来估计已经灭绝的类人猿和人类远祖的社会行为。
We used this information to estimate the social behaviour of extinct apes and hominins.
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