spontaneous

spontaneous
[spɒnˈteɪnɪəs]
adjective
  1. performed or occurring as a result of a sudden inner impulse or inclination and without premeditation or external stimulus
    自发的，不由自主的
    the audience broke into spontaneous applause.
    观众们情不自禁地热烈鼓掌。
    a spontaneous display of affection.
    爱意的自然流露。
    ■(of a person) having an open, natural, and uninhibited manner
    （人）天真率直的
    ■(of a process or event) occurring without apparent external cause
    （程序，事件）自发的，自然的
    spontaneous miscarriages.
    自然流产。
    ■(archaic)(of a plant) growing naturally and without being tended or cultivated
    (古)（植物）自生的，野生的，非人工栽培的
    ■(Biology)(of movement or activity in an organism) instinctive or involuntary
    (生)（器官中的活动）本能的；自发的
    the spontaneous mechanical activity of circular smooth muscle.
    环状平滑肌的自然机械活动。
派生
spontaneity
noun
spontaneously
adverb
语源
  1. mid 17th cent.: from late Latin spontaneus (from (sua) sponte 'of (one's) own accord') + -ous
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