The “Knocking on Wood” Wikipedia page mentions Roud’s conclusion, and this claim of a 19th century origin has circulated online as the final say on the matter. If you go back to the original, though, Roud’s proposal actually ends on an ambivalent note: “Before this theory [of 19th century origins] can be finally accepted, however, an examination of the history of European forms of this custom would be advisable.”
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讯飞AI会议耳机Air2则主打开放式舒适体验，采用0.8mm航天级钛丝骨架与智能防漏音技术，单耳仅10克，支持53小时超长续航与离线闪录功能，完美兼顾了长时间佩戴的舒适性与突发会议的高效记录需求。未来智能正以AI助理与极致声学的双轮驱动，重构职场办公效率边界。。关于这个话题，heLLoword翻译官方下载提供了深入分析
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.