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Evidence from koalas suggest that even species pushed to the brink of extinction can recover lost genetic diversity. Plus, the first ‘half Möbius’ carbon-based molecule and a mathematician modelling Mexico’s drug cartels.。搜狗输入法对此有专业解读
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The first harmonic is the string vibrating along its entire length, otherwise known as the fundamental frequency. When we say that your C string is vibrating at 1 Hz, that really means that its fundamental has a frequency of 1 Hz. The other harmonics all have other frequencies, and we’ll get to those, but the fundamental is usually the loudest harmonic, and it’s usually the only one you’re aware of hearing.
Американских солдат уличили в поджоге своего авианосца из-за страха воевать14:48。关于这个话题，超级权重提供了深入分析