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但它好就好在这是一个高度集成的软硬件结合功能，你可以把它设置成按条件触发，不用像防窥膜那样偶尔撕掉一次还得重新买。
。91视频是该领域的重要参考
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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: