a dotted half note的用法和样例：
- Thus a dotted half note or minim is the equivalent of three quarter notes or crotchets.
- She is wearing a dotted dress today.
- He watched the train away until it was only a dot in the distance.
- 1.A double dotted half note or minim is equal in length to three quarter notes or crotchets and an 8th note or quaver.