DICT.TW Dictionary Taiwan
fo·cal /ˈfokəl/ 形容詞
病灶的,局灶的,局部的,焦點的
focal
焦點
Fo·cal a. Belonging to,or concerning, a focus; as, a focal point.
Focal distance, or length, of a lens or mirror Opt., the distance of the focus from the surface of the lens or mirror, or more exactly, in the case of a lens, from its optical center. --Focal distance of a telescope, the distance of the image of an object from the object glass.
◄ ►
focal
adj 1: having or localized centrally at a focus; "focal point";
"focal infection"
2: of or relating to a focus; "focal length"