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focal    音標拼音: [f'okəl]
a. 焦點的,在焦點上的

焦點的,在焦點上的

focal
焦點

focal
adj 1: having or localized centrally at a focus; "focal point";
"focal infection"
2: of or relating to a focus; "focal length"

Focal \Fo"cal\, a. [Cf. F. focal. See {Focus}.]
Belonging to,or concerning, a focus; as, a focal point.
[1913 Webster]

{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.
[1913 Webster]

66 Moby Thesaurus words for "focal":
approaching, arch, asymptotic, banner, basic, bedrock, capital,
cardinal, central, centralized, centred, centripetal, centrolineal,
champion, chief, concentrated, concurrent, confluent, confocal,
connivent, convergent, converging, crowning, dominant, essential,
first, foremost, fundamental, great, headmost, hegemonic,
indispensable, leading, life-and-death, life-or-death, magisterial,
main, master, material, meeting, mutually approaching,
of vital importance, overruling, paramount, predominant,
preeminent, preponderant, prevailing, primal, primary, prime,
principal, radial, radiating, ranking, ruling, sovereign, star,
stellar, substantive, supereminent, tangent, tangential, topflight,
uniting, vital

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