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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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