And although migration is the only thing which prevents many European populations from shrinking, an influx of outsiders will not change age-structures by much.
虽然吸取移民是唯一的可以阻止欧洲人口缩减的方法，但是流入的外来移民不会对年龄结构产生很大的改变。
2
These type of structures began showing up near the end of the stone age all across Europe in what is called the megalithic age when people were energetically building structures such as Stonehenge.
And because those artifacts closely resemble others from nearby sites previously carbon-dated to about 9000 B.C., Schmidt and co-workers estimate that Gobekli Tepe's stone structures are the same age.