古胥河畔，南京高淳“东坝大马灯”的表演好不热闹。7个娃娃身骑“竹马”，扮上花脸，衣着戏袍：绿衣是关羽，黑脸的是张飞，骑白马的是赵云……7匹“竹马”之下，各有两名成年人默契配合，前一人戴道具扮马头，后一人屈身披锦作马身，演绎战马的静立和奔腾。令旗所指，摆出三角阵、四角阵、梅花阵……
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.”，详情可参考Line官方版本下载
，更多细节参见safew官方版本下载
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The spines of sea urchins can generate a voltage when water moves around them — a phenomenon that could be used to design underwater flow sensors.