声调

例句：

1. 1. The singer's voice has a beautiful melody.
   那位歌手的声音有美妙的旋律。
2. 2. The children are learning to sing with proper intonation.
   孩子们正在学习用正确的音调唱歌。
3. 3. The teacher corrected the student's pronunciation during the lesson.
   老师在课上纠正了学生的发音。