a waste of breath的用法和样例：
- The years to come seemed waste of breath, A waste of breath the years behind.
- It's only a waste of time to speak to her.
- It's a waste of money betting on that old nag!
- I've finished with gambling it's a waste of money.
- Doing such a job is a waste of his talents.
- It will be a waste of time. You will come full circle.