We can't go all over the world, and work with every single population of whales.

我们不能走遍全世界，与每个鲸鱼种群一起工作。

But at some point, there was probably a single population that expanded and basically replaced other populations in Europe.

但在某个时刻，可能只有一个种群在扩张，基本上取代了欧洲的其他种群。

He said, " We're down to a very few, tiny little habitats in only 13 springs, so we can't afford to lose a single population."

“我们只在13潭泉水中发现了这种蜗牛非常少、非常小的栖息地，所以我们承受不住失去一个单种群的代价。”

According to data released by China's Ministry of Civil Affairs, China's single population reached 240 million in 2018, while 77 million people lived alone.

中国民政部公布的数据显示，2018年中国单身人口达到2. 4亿，独居人口达到7700万。

Basically, a single population of T. rex would've occupied two different niches at the exact same time, all thanks to physical differences between the age groups.

基本上， 单个霸王龙种群会同时占据两个不同的生态位，这要归功于年龄组之间的身体差异。