The report pointed out how birth rates in the U.S. have been below the minimum replacement rate since 2008, meaning that the bulk of population growth since then has been the result of immigration. This has proved especially true for the country’s labor force. Nearly 80% of immigrants are of working age, according to the Census, and they account for 19% of the workforce, around 33 million people.
过去这五年，是全球新冠疫情、地缘政治、产业重构的五年，也是数字化和智能化的五年，特别是人工智能这一变革性技术，正在重塑行业生态。传统行业以技术创新打破内卷桎梏，新兴产业则以技术破壁、开疆拓土。
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2024年12月20日 星期五 新京报
The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.