短语词组短語focal aperture surface 焦曲麪focal surface display 焦麪顯示;焦平麪顯示;焦點表麪顯示minimal focal surface 極小焦麪的the focal surface 焦曲麪focal surface of a congruence 線滙的焦曲麪focal surface of two sheets 雙葉焦曲麪 返回 focal surface