Negative net migration hasn’t definitively happened in the U.S. for almost a century, not since the Great Depression. The U.S. native-born population is also in free fall, well below the replacement rate needed to maintain population numbers in the long run. With fewer immigrant arrivals already dealing a blow to the workforce, the shrinkage of the American taxpayer base is set to further widen the country’s deficit and hurt its prospects for economic growth.
Трамп определил приоритетность Украины для США20:32
。51吃瓜对此有专业解读
The UN Sustainable Development Goals represent a carefully-crafted road map for future human and planetary prosperity.。clash下载 - clash官方网站是该领域的重要参考
自动驾驶最核心的目标是安全。但并不意味着安全就可以为所有其他东西让路，没人想要为了安全而要一个慢吞吞、没效率、跑不动的东西。解决这个矛盾，核心是提升基础能力——只有基础能力上去，才能在不牺牲其他维度的前提下，把安全做到更高水平。