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罕见病“不罕见”ACH是儿童生长发育障碍的一类罕见疾病，发病率约为1/15,000–1/25,000，全球共计约25万患者。虽然ACH是罕见病，但大家对“侏儒症”并不陌生，ACH则占全部遗传学侏儒症的70%左右。
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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.