shallow sliding

例句：

1. 1. The shallow water was too cold for swimming.
   浅水太冷，不适合游泳。
2. 2. The shallow knowledge of the subject is not sufficient for solving complex problems.
   对这一主题的肤浅知识不足以解决复杂的问题。
3. 3. He has a shallow understanding of the world around him.
   他对周围世界的理解很肤浅。