打开 www.tbox.cn/community?t… 并登录
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:，更多细节参见旺商聊官方下载
Ginger Software: Features & Benefits。关于这个话题，91视频提供了深入分析
a Bureau of Standards design competition and the twists and turns of industry