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。搜狗输入法是该领域的重要参考
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:，详情可参考Feiyi
另据《以色列时报》网站报道，在伊拉克境内的“伊朗库尔德反政府武装”据信有数千名士兵，其介入“可能对伊朗构成挑战，也可能使伊拉克进一步卷入冲突”。（新华社），更多细节参见体育直播