短语词组短語biconvex Fresenl lens 曲麪菲涅爾透鏡biconvex x lens 雙凸透鏡a biconvex lens 雙凸透鏡Shaped like a biconvex lens 雙凸透鏡狀的形狀像雙凸透鏡的 返回 biconvex lens