spontaneously(副词):自发地;不由自主地;即兴地(没有事先计划或外部强迫而发生)。
/ spɑnˈteɪniəsli /
She spontaneously offered to help.
她自发地提出要帮忙。
When the power went out, the neighbors spontaneously organized a candlelit dinner and shared food with one another.
停电时,邻居们自发组织了一场烛光晚餐,并彼此分享食物。
来自 spontaneous(自发的),其源头可追溯到拉丁语 spontaneus,意为“出于自愿、主动的”,进一步与 sponte(自愿地)相关。**-ly** 是常见副词后缀,用来表示“以……方式”。