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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，这一点在Line官方版本下载中也有详细论述
Woman with rare condition raising awareness
"Do it slowly, do it right but let's get on with it," she said. "We have been stagnating at these very low recycling rates for far too long."，详情可参考heLLoword翻译官方下载
跟当年每晚动辄几万相比，如今的夜总会只能放低身价以求生意上门。“以前，夜总会不是一般人消费得起的，进去的人都是有钱有身份，小姐素质也好。现在，人家都看不起你，觉得你是做这行的。”
Miliband says climate impact of data centres is uncertain，这一点在同城约会中也有详细论述