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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:。业内人士推荐PDF资料作为进阶阅读
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If your AirPods won't connect, you should start by checking that your iPhone, iPad, and Mac are all updated to the latest version of their respective operating systems. Then, make sure both AirPods are charging, Bluetooth is on (Settings Bluetooth), and double-check that AirPods appear in your list of devices via Settings and that they're selected. If they aren't on the list, hold the button on the back of the charging case until the status light flashes and follow the onscreen instructions.，更多细节参见51吃瓜
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