If you watch slow-motion video of a guitar string vibrating, you’ll see a complex, evolving blend of squiggles. These squiggles are the mathematical sum of all of the string’s different harmonics. The weird and interesting thing about harmonics is that each one produces a different pitch. So when you play a note, you’re actually hearing many different pitches at once.
"Scientific documentation would necessitate systematic video recording rather than visual monitoring," he clarified.
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但在这些成果之下,难题依旧存在。中国的结核病新发病例数在全球范围内仍高居第四位,仅次于印度、印度尼西亚和菲律宾。疫情在地域上分布极不均衡,西部地区的发病率显著高于中部和东部;从人群分布来看,65岁以上的老年患者比例已超过45%,成为防控工作的关键对象。
25 марта 2026, 07:59Российская Федерация
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