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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.。一键获取谷歌浏览器下载对此有专业解读
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NASA's decision to bring the crew home one month early, on Jan. 15, marked the agency's first controlled medical evacuation from the station in its 25 years of continuous operations. The incident highlighted the limits of treating complex health problems 250 miles away from Earth.。业内人士推荐heLLoword翻译官方下载作为进阶阅读
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Researchers summarize key insights from the world’s first comprehensive investigation into how a pandemic started.