| 释义 |
principal focus 【物理学】主焦点[亦作 focal point] 以上来源于：《21世纪大英汉词典》 principal focusn.=focal point, 1详细释义源自:《新世纪英汉大词典》Collins外研社 n= focal pointprincipal focus‘光’主焦点principal focus主焦点principal focus主焦距principal focusn.（名詞 noun）【理】焦點(= focal point)principal focu |