vt.

1. 调整；控制；缓和
2. 【音】使变调
3. 声调抑扬地唱
4. 【无】调制

v.

1. exert a modifying influence on; regulate.
2. vary the strength, tone, or pitch of (one's voice).
   ▸alter the amplitude or frequency of (an oscillation or signal) in accordance with the variations of a second signal.
3. Music  change from one key to another.