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precursor    音标拼音: [prik'ɚsɚ]
n. 先驱者,前导,先进者

先驱者,前导,先进者

precursor
n 1: a substance from which another substance is formed
(especially by a metabolic reaction)
2: a person who goes before or announces the coming of another
[synonym: {precursor}, {forerunner}]
3: something that precedes and indicates the approach of
something or someone [synonym: {harbinger}, {forerunner},
{predecessor}, {herald}, {precursor}]

Precursor \Pre*cur"sor\, n. [L. praecursor, fr. praecurrere to
run before; prae before currere to run. See {Course}.]
One who, or that which, precedes an event, and indicates its
approach; a forerunner; a harbinger.
[1913 Webster]

Evil thoughts are the invisible, airy precursors of all
the storms and tempests of the soul. --Buckminster.
[1913 Webster]

Syn: Predecessor; forerunner; harbinger; messenger; omen;
sign.
[1913 Webster]

166 Moby Thesaurus words for "precursor":
advance guard, agent, airhead, alterant, alterative, alterer,
ancestor, ancestors, announcer, antecedence, antecedency,
antecedent, anteposition, anteriority, apprentice, architect,
artificer, artist, author, avant-garde, battle line, beachhead,
begetter, beginner, bridgehead, buccinator novi temporis, builder,
catalyst, catalytic agent, colonial, colonist, colonizer,
conceiver, constructor, craftsman, creator, danger sign, designer,
deviser, discoverer, dominion, early bird, early comer,
early riser, early symptom, effector, engenderer, engineer,
executor, executrix, falling barometer, farthest outpost, father,
ferment, first arrival, first line, forefront, foregoer, foregoing,
forerunner, foreshadower, founder, front, front line,
front position, front rank, front-runner, gathering clouds,
generator, grower, harbinger, heading, herald, high sign,
homesteader, immigrant, inaugurator, industrialist, initiator,
innovationist, innovator, instigator, institutor, introducer,
inventor, journeyman, le pas, leading, leaven, line, maker,
manufacturer, master, master craftsman, messenger, modificator,
modifier, mother, nester, omen, organizer, originator, outguard,
outpost, outrider, past master, pioneer, planner, planter, point,
precedence, precedency, precedent, preceding, precession,
predecessor, preference, prefixation, preliminary sign, prelude,
premise, premonitor, premonitory sign, premonitory symptom,
presager, prime mover, priority, prodroma, prodrome, producer,
prothesis, prototype, quarantine flag, railhead, raiser, realizer,
red flag, red light, scout, settler, shaper, sire,
skull and crossbones, smith, sooner, spearhead, squatter,
storm petrel, stormy petrel, superiority, symptom, the lead,
thundercloud, thunderhead, top priority, transformer,
transmogrifier, urgency, van, vanguard, warning sign,
warning signal, wright, yeast, yellow flag, yellow jack


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  • See the difference in rear poarches on SD-40,2 and SD-40,2SS.
    This test may have been the precursor to an order UP had for an additional 120 SD40-2's (3809-3928) for delivery in the first three quarters of 1981 Eighty of these were cancelled in early 1981; the remaining 40 were cancelled in June 1981 The cancelation of more SD40-2s was likely victim of the planned merger with WP and MP
  • Who came up with Two Longs, a Short, and a Long? - Trainorders. com
    My 1939 Consolidated Code of Transportation Rules and General Instructions (Precursor of GCOR) specify two longs, a short, and a long for 14 L The latter arrangement is a whole lot easier to implement
  • Nostalgia History gt; Railroads carrying Ford Fast - Trainorders. com
    I'm going to assume then that the 'Ford Fast' trains were the precursor to the SP's KCOAF auto trains that ran from the 1980s into the 1990s, is that correct? No idea what the DRGW symbol was for those trains, but I don't think the MP was involved with trains by that time, as the DRGW had trackage rights across Kansas on the MP's Pueblo line
  • Nostalgia History gt; Dinkey Engines - Trainorders. com
    Website of posting, West of Buena Vista, photo GB-6129 #104; #116; #116; #112; #58; #47; #47; #119; #119; #119; #46; #116; #114; #97; #105; #110; #111; #1
  • EMD Truck Tests in the 1980s - Trainorders. com
    I started as an engineering co-op at EMD the summer of 1984 I can remember walking out and seeing the work being done in the high bay and thinking it was quite interesting as well as odd All these years I have always assumed that the work on the 4 axle steering truck was a precursor to the self steering 3 axle
  • Western Railroad Discussion gt; Generators Alternators - Trainorders. com
    More than a few of these were built LV had some, SOU 2823-2878, NW 4100-4159, not sure about B O, C O, or PC I think they were only built in 1971 as the precursor to the GP38-2, which had the alternator as standard equipment
  • Monterey Branch Line Saga continues - Trainorders. com
    The Caltrans 2018 State Rail Plan, the TAMC 2021 Monterey Bay Area Rail Network Integration Study, and the draft Caltrans 2023 State Rail Plan all endorse the near-term bus service as aprecursor to eventual rail service on the corridor
  • mundo: Maroon Monday in B W - Convert-A-Frate - Trainorders. com
    The more interesting thing to me was the single axle freight trucks which became the precursor to the single truck TTUX intermodal car [ Reply To This Message ] [ Quote ] Date: 05 07 18 09:36





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