Green: Surfing terms
Now that we can build the tree, let's use it to search. Finding a specific point means starting at the root and asking: which child quadrant contains this coordinate? Then you recurse into that child and ask again. Each level of the tree cuts the search space by roughly three-quarters.
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2021—2025 年度，中国企业研发投入的区间分布保持稳定，延续了以亿元和千万元级企业为“腰部力量”、百亿元以上和千万元及以下企业作为“首”“尾”两端的基本态势。腰部区间覆盖了最大比例的企业数量，构成了研发梯队的中坚部分。
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.