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.”
// 测试函数：验证排序正确性
。同城约会是该领域的重要参考
新动能积厚成势。规模以上高技术制造业增加值占规模以上工业增加值的比重超过17%，数字经济增加值有望达到49万亿元，新能源汽车国内新车销量占比超过50%，工业互联网融合应用全面覆盖41个工业大类行业。
1、实时报送信息：自本通知发布之日起，每日报送船舶当日航经阿曼湾、霍尔木兹海峡、波斯湾海域的实时动态信息；