* @param i 当前节点索引
Siminoff declined to address whether reports of Flock sharing data with U.S. Customs and Border Protection also played a role. Dozens of towns across the U.S. have cut ties with Flock over exactly those concerns. Still, the timing of Ring’s decision was notable. While Siminoff believes some customers are misreading his products, he knows Ring can’t afford to dismiss their anxieties, particularly right now.
。关于这个话题，新收录的资料提供了深入分析
The second harmonic is the one you get from the string vibrating in halves. Each half of the string vibrates at twice the frequency of the whole string. The 2:1 relationship between the pitches of the first and second harmonics is called an octave. (I know that the word suggests the number eight, not the number two. Don’t worry about it.) The pitch that’s an octave above middle C has a frequency of 2 Hz, and it is also called C. Both of these notes have the same letter name because in Western convention, notes an octave apart from each other are considered to be “the same note“. The important concept here is that you can move up an octave from any pitch by doubling its frequency. You can also move down an octave from any pitch by halving its frequency.
// post-compaction hook: re-inject key context that may have been lost