A freeware, no-frills electronic tuning fork. All it does is allow the user to play a specific note. Useful for a cappella choirs when no-one has perfect pitch.是什么意思_A freeware, no-frills electronic tuning fork. All it does is allow the user to play a specific note. Useful for a cappella choirs when no-one has perfect pitch.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句