第六课：音级和变音记号

A half step is the distance from one key on the keyboard to the next adjacent key.
（钢琴键盘上两个键相邻的距离是一个半音）
Key 1 to Key 2 is a half step since they are next to each other.
（相邻的键1和键2的距离是一个半音） |

A half step is not always from a white key to a black key.
（半音并不总是从一个白键跳到一个黑键）
In this example, Key 1 and Key 2 are still next to each other.
（在这个例子中，键1和键2也是相邻的） |

An accidental is a sign used to raise or lower the pitch of a note.
（变音记号被用来抬升或降低一个音的音高）
The first accidentals that we will discuss are the flat and the sharp.
（我们先来看一下降音记号和升音记号）
The flat lowers a note by a half step while the sharp raises a note by a half step.
（降音记号将一个音符的音高降低一个半音，升音记号将一个音符的音高升高一个半音）
When typing, you can use a # to represent a sharp and a b to represent a flat.
（打字的时候可以用#来代表升音记号，用b来代表降音记号）