ossia

例句：

1. 1. The music has a beautiful melody, and each note is an ossia.
   这首音乐旋律优美，每个音符都是一个音素。
2. 2. The teacher explained the concept of ossia to us in detail.
   老师详细地解释了音素的概念。
3. 3. Ossia are the smallest units of sound that can be distinguished by the human ear.
   音素是人耳能够区分的最小的声音单位。