Most rainforests too degraded to provide good habitats 多数雨林退化严重而无法为 ...
Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.
The Arctic town where polar bears and humans live side by side 北极熊和人类彼此 ...
Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...
SBS2 年
人口学专家：生育高成本致三孩政策难达成目标
中国在去年底公布的十年一次的人口普查结果后，于近期宣布允许每对夫妇最多可生育三个孩子，这是对二孩生育限制的一个重大政策转变。 2016年 ...