第一百零一条 询问聋哑的违反治安管理行为人、被侵害人或者其他证人，应当有通晓手语等交流方式的人提供帮助，并在笔录上注明。
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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:
Последние новости，这一点在im钱包官方下载中也有详细论述