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:
Demna is fashion’s dark lord of apocalyptic streetwear. Gucci is the glossy sex kitten of Milan. Put the two together, and what do you get? Sex appeal that flirts with bad taste.
，这一点在WPS下载最新地址中也有详细论述
Because this is regular Smalltalk code, all standard development tools work out of the box: syntax highlighting, code completion, navigation, and refactorings:
Excellent research capabilities