theoretician [ˌθiərɪˈtɪʃən, ˈθɪrɪ-]

例句:

• The Evangelist is actually the opposite of The Theoretician.
  传教士实际上就是理论家的反面.
  
• Do you know that you have become quite a theoretician?
  你知道 吗 ?你已经成为了一个了不起的理论家了.
  
• LI Yu was one famous drama theoretician of Chinese ancient.
  李渔是中国古代著名的戏曲理论家.
  
• Of course, he is a great theoretician and noble man.
  来自VOA
• Lawrence was a superb tactician and a highly influential theoretician of guerrilla warfare.
  来自BBC
• El Naschie is an engineer and works in quantum gravity and fractal spacetime which means he is a theoretician.
  来自SA