in a way that is not planned but done because you suddenly want to do it 自发的;非筹划安排的 - (specialist)
naturally, without being made to happen 自发的;自然的;自身造成的 naturally, without being forced, practised or organized in advance 自然的;非勉强的;无雕饰的 Opposition groups arose spontaneously after the new president took power. 新总统掌权后,反对派自发地出现了。