| 释义 |
principal point 【光学】主点 以上来源于：《21世纪大英汉词典》 principal point‘光’主点principal point航照主点principal point主要点principal point像主点principal point主点principal pointn.（名詞 noun）【光】主點document.write('function myFunction(n){var c=document.getElementById("maintb").childre |