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principal

[n]
英语解释:the original amount of money that someone borrows, which is paid back with additional money called interest
常见翻译:主演,主角

• He was one of the principals of the film.
  
• 他是这部影片的主演之一。
  

• The principal points of a thin lens coincide at the center of the lens.
  
• 薄透镜的两个主点与透镜中心相重合。