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adj(1)自動的((of a machine) working by itself without needing to be operated by a person)：an～device/elevator/rifle/washing-machine/dishwasher/gear-change/temperature control/data processing/process 自動裝置/電梯/步槍/洗衣機/洗碗機/變速/溫度控制/數(shù)據(jù)運算/程序;～pilots/transmission/gears 自動駕駛儀/變速裝置/排檔;ships with～helmsmen 自動駕駛的船;Is the machine～? 這機器是自動的嗎?〖同〗self-operating，self-moving;〖反〗manual;

(2)無意識的，機械的((of an action)done without thinking，esp as a habit;unconscious)：Breathing/The heartbeat/Her reaction is～.呼吸/心跳/她的反應(yīng)是無意識的。His response was completely～.他的反映完全是下意識的。Blinking is～reaction.眨眼是下意識的反應(yīng)。an～gesture 無意識的姿勢;He was so used to driving that it had become～.他完全習(xí)慣開車了，一切已成了無意識的動作?！纪絬nconscious，uncontrolled;〖反〗conscious，controlled，voluntary;

(3)自然而然的(certain to happen)：get an～increase in pay every year 每年自然而然地得到加薪;These offences carry～fines.這些過錯自然要罰款。～enthusiasm 自然而然產(chǎn)生的熱情;

n(1)自動裝置(機器，槍，工具)(device or machine that works by itself without needing to be operated by a person)[C]：He has two～s and a rifle.他有兩支自動步槍和一支來復(fù)槍。

(2)自動變速車(car with automatic transmission)[C]：Some people who drive a lot in town prefer～s.常在城市里駕車的人有的更喜歡自動變速車。

→ ?auto′matically adv 自動地;?auto′mation n 自動，自動化;au′tomaton n 機器人，機械工作的人;

【辨異】automatic與involuntary都表示“非意識的”之意。automatic指對某固定刺激的不變的反應(yīng)，如：The patellar reflex is～.(膝蓋骨反射是無意識的。)而involuntary(無意識的，無目的的)指隨情況、環(huán)境而不同的意外反應(yīng)，如：an involuntary cry of pain(痛疼引起的本能反應(yīng))。