a tremulous voice的用法和样例：
- She answered the king's question with a tremulous voice.
- She saw herself in a score of pathetic situations in which she assumed a tremulous voice and suffering manner.
- I asked, with a very tremulous voice.
- spoke timidly in a tremulous voice.
- the old lady's quavering voice; spoke timidly in a tremulous voice.
- Said, in a tremulous voice, "Why don't you speak for yourself, John?"