But there are plenty of wild cards ahead, as Ullrich and others are quick to acknowledge.
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英國國家社會研究中心的資深研究員約翰·柯蒂斯爵士（Prof Sir John Curtice）表示，他們每年持續得到相同趨勢，讓他對其結果比對YouGov的兩個單點數字更有信心。
What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:，这一点在爱思助手下载最新版本中也有详细论述
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