开放作文（满分15分）
请根据下面提示,写一篇短文。词数不少于50。
In your English class, the teacher shows the picture below and asks the class to discuss it. Your classmates may have different understandings.
Look at the picture carefully and tell the class how YOU understand it.

Vocabulary support:
千里马：    swift horse
拉磨，碾磨：grind
磨坊：      mill