For example, vibration frequency of 440 times per second, the vibration cycle for each 1 / 440 second, this is the time of the wavelength.是什么意思_For example, vibration frequency of 440 times per second, the vibration cycle for each 1 / 440 second, this is the time of the wavelength.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句