super-specialization       
noun [ C or U ] (also superspecialization); (UK usually super-specialisation) uk/ˌsuː.pəˌspeʃ.əl.aɪˈzeɪ.ʃən/ us/ˌsuː.pɚˌspeʃ.ə.ləˈzeɪ.ʃən/
 超专业;超专业化
a very particular area of knowledge or the process of becoming an expert in a very particular area
  She knows a lot about French history but has a super-specialization in the Belle Époque. 她对法国历史知之甚深,尤其专擅“美好时代(1871-1914)”。 
 Current science policies encourage project focus and super-specialisation. 当前的科学政策鼓励项目具有重点和超级专业化。 
 - More examples
 - The doctor has a super-specialization in paediatric diseases of the ear and is one of the most renowned researchers on that subject.
 - The surgeon has operated on many famous athletes but her superspecialization is in treating sports hernias.
 - The advantage of super-specialisation is that it reduces the time required to train.