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第四节 妨害社会管理的行为和处罚，推荐阅读一键获取谷歌浏览器下载获取更多信息
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警方使用催泪瓦斯驱散人群，但部分民众多次返回现场，严重干扰了救援工作和现场控制。
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.”