He added the ultrasonic speakers are lowered into the seabed "a bit like a lobster pot".
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.”。关于这个话题，搜狗输入法2026提供了深入分析
没有声音，没有动作。在旁人眼中，你只是短暂地停顿，便获取了信息。，这一点在服务器推荐中也有详细论述
Editorial standards Show Comments。关于这个话题，im钱包官方下载提供了深入分析
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