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focal 音标拼音: [f'okəl] a. 焦点的,在焦点上的 焦点的,在焦点上的 focal 焦点 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 1. FOrmula CALculator.
An interactive system written by Rick Merrill of {DEC} in 1969 for {PDP-5} and {PDP-8}. It was a descendant of {AID}/{JOSS}. Versions: FOCAL-69, FOCAL-1971, FOCAL-11 (for {PDP-11} under {RT-11}). (1994-12-21) 2. Forty-One CAlculator Language. The programming language of the HP-41 calculator line. (1994-12-21)
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