1. Play an E, then play a D♯ (the black key to the left of E on your piano) and you are playing the musical interval of a major second.
（请弹奏一个E，然后弹奏一个D♯（钢琴上E左边的黑键），这样你就演奏了一个大二度的音乐间隔。）
2. You will need to play those notes with a particular finger position that allows you to play mi and fa with ease.
（你需要用特定的手指姿势演奏这些音符，这样能够轻松地演奏mi和fa。）