a grumbling appendix的用法和样例：
- When they entered, the Thenardier said to them in a grumbling tone which was full of adoration, "Ah!
- There is a vein of melancholy in his character.
- There was a long lag in forwarding mail to us.
- A bowl of hot chicken soup is good for you.
- A cloud is a mass of vapor in the sky.