adj. 1.自动的；机械的。 2.【生理】自动性的，无意识的。 n. 1.自动机械；自动装置。 2.自动手枪。
operating with minimal human intervention; independent of external control; "automatic transmission"; "a budget deficit that caused automatic spending cuts"
resembling the unthinking functioning of a machine; "an automatic `thank you''"; "machinelike efficiency" 同义词：automatonlike, machinelike, robotlike, robotic,
without volition or conscious control; "the automatic shrinking of the pupils of the eye in strong light"; "a reflex knee jerk"; "sneezing is reflexive" 同义词：reflex, reflexive,
a pistol that will keep firing until the ammunition is gone or the trigger is released 同义词：automatic pistol,
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