单词 varifocal 释义 varifocal, a.|vrfkl|[f. vari- + focal a.]a. Having a focal length that can be varied.1945Jrnl. Soc. Motion Picture Engineers XLV. 466 A new positive Vari-Focal view-finder for motion picture cameras.1962Jrnl. Optical Soc. Amer. LII. 3...