专业人才

例句：

1. 1. He isa specialist in the field of physics.
   他是物理学领域的专家。
2. 2. She is an expert in her field of expertise.
   她是她专业领域的专家。
3. 3. The doctor is an expert in treating heart disease.
   这位医生是心脏病治疗方面的专家。