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.
“我们将持续深化区域协同，充分发挥先行示范作用，推动京津冀协同发展不断取得新成效。”冯国祥说。，更多细节参见新收录的资料
ChandelureIntroduced in Gen V (2010)。关于这个话题，新收录的资料提供了深入分析
a library of royalty-free videos, images, and music to use in content，这一点在新收录的资料中也有详细论述