shallow ploughing and careless clutivation

例句：

1. 1.The shallow lake is not suitable for fishing.
   这个浅湖不适合钓鱼。
2. 2. He has a shallow understanding of the topic.
   他对这个话题的理解很肤浅。
3. 3. The shallow knowledge of history can only serve as a foundation for learning.
   对历史的肤浅认识只能作为学习的基础。