gezhidian

例句：

1. 1. He has a deep understanding of the subject matter.
   他对这门学科有深刻的理解。
2. 2. She is an expert in her field of expertise.
   她在她擅长的领域是一位专家。
3. 3. The importance of education cannot be overstated.
   教育的重要性不可忽视。