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:
1. 根据数据范围创建若干个桶
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同时，穆贾希德谴责巴基斯坦多次越境袭击阿境内平民。他称，恐怖组织“巴基斯坦塔利班”与巴军队冲突等问题是巴内部问题，不应转嫁给阿富汗。
The Baked Good Quadrant: The items here are only breakfasts by convention. Any of them could be served at other meals, and often are.
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Author(s): Jean-Michel Bergheau, Jean-Baptiste Leblond