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fn idx2d(shape: int[], row: int, col: int) - int {。新收录的资料对此有专业解读
The scientific term for the rate of the string’s vibration is its frequency. You measure frequency in hertz (Hz), a unit that just means “vibrations per second.” The standard tuning pitch, 440 Hz, is the pitch you hear when an object (like a tuning fork or guitar string) vibrates to and fro 440 times per second.，推荐阅读新收录的资料获取更多信息
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