| 单词 | principal point |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔focal point〕The focal length is the distance between the principal point of a lens and the focal point.焦距是透镜的主点与焦点之间的距离。外研社新世纪〔summation〕A concluding part of a speech or an argument containing a summary of principal points, especially of a case before a court of law.总结：讲话或论证的结论部分，包括要点的总结，尤指法庭上辩论的总结美国传统 |
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