【释义】
something that is spontaneous has not been planned or organized, but happens by itself, or because you suddenly feel you want to do it
自发的，自然而生的; 一时冲动的:
【例句】
The crowd gave a spontaneous cheer.
人群自发地欢呼起来。
【例句】
My spontaneous reaction was to run away.
我的本能反应就是逃跑。
