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1. Oxford American Dictionary

   spontaneously

   • IPA[spänˈtānēəslē]

   美式

   • adv.
     as a result of a sudden impulse and without premeditation；without apparent external cause or stimulus
2. • 釋義

   adv.

   副詞

   • 1. as a result of a sudden impulse and without premeditation the crowd spontaneously burst into song 同義詞 without being asked, of one's own accord, voluntarily, on impulse, impulsively, ... 更多on the spur of the moment, extempore, extemporaneously, informaloff the cuff
   • ▪ without apparent external cause or stimulus a surprising number of early pregnancies spontaneously abort mutations can occur spontaneously