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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:，这一点在爱思助手下载最新版本中也有详细论述
After taking a few days to tweak my choices and figure out what I like best, I've settled into a really nice routine: Aurora Borealis as the Bedtime Cue, an hour of Forest Wind as my Wind Down and a Noise Mask of Brown Noise to play throughout the night. I love how easy it is to set the nighttime routine in motion once it's established. When I hear the Aurora Borealis come on, I start making my preparations for bed. Brush teeth, take meds, lights out and, crucially (I'm trying really hard to be disciplined, here), my phone goes face-down on the nightstand until morning. If I want to stay up late that night and ignore the Bedtime Cue, I can just hit the little stop button on the display. But once I'm ready to actually try to fall asleep, all I need to do is swipe down on the display to initiate the Wind Down, and Forest Wind will start playing.，更多细节参见同城约会
3. 对count做前缀和，得到每个值的最终位置