a host of angels的用法和样例：
- In the middle, the madonna, slight and bathed in light, is surrounded by by a host of angels that accompany her joyfully hailing.
- A host of friend meet him at the railroad station.
- A host of friends met him at the railroad station.
- A host of compelling socioeconomic problems.
- Our era produces a host of heroes and heroines.
- I'm sure the audience has a host of questions for our team of experts.