donkey engine
 小型輔助發動機,小型機車


 doc·tor n.
 1. A teacher; one skilled in a profession, or branch of knowledge; a learned man. [Obs.]
    One of the doctors of Italy, Nicholas Macciavel.   -- Bacon.
 2. An academical title, originally meaning a man so well versed in his department as to be qualified to teach it.  Hence: One who has taken the highest degree conferred by a university or college, or has received a diploma of the highest degree; as, a doctor of divinity, of law, of medicine, of music, or of philosophy. Such diplomas may confer an honorary title only.
 3. One duly licensed to practice medicine; a member of the medical profession; a physician.
 By medicine life may be prolonged, yet death
 Will seize the doctor too.   -- Shak.
 4. Any mechanical contrivance intended to remedy a difficulty or serve some purpose in an exigency; as, the doctor of a calico-printing machine, which is a knife to remove superfluous coloring matter; the doctor, or auxiliary engine, called also donkey engine.
 5. Zool. The friar skate. [Prov. Eng.]
 Doctors' Commons. See under Commons.
 Doctor's stuff, physic, medicine. --G. Eliot.
 Doctor fish Zool.,  any fish of the genus Acanthurus; the surgeon fish; -- so called from a sharp lancetlike spine on each side of the tail. Also called barber fish. See Surgeon fish.

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 Don·key n.; pl. Donkeys
 1. An ass; or (less frequently) a mule.
 2. A stupid or obstinate fellow; an ass.
 Donkey engine, a small auxiliary engine not used for propelling, but for pumping water into the boilers, raising heavy weights, and like purposes.
 Donkey pump, a steam pump for feeding boilers, extinguishing fire, etc.; -- usually an auxiliary.
 Donkey's eye Bot., the large round seed of the Mucuna pruriens, a tropical leguminous plant.

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 donkey engine
      n 1: a locomotive for switching rolling stock in a railroad yard
           [syn: switch engine]
      2: (nautical) a small engine (as one used on board ships to
         operate a windlass) [syn: auxiliary engine]