spontaneous combustion自燃
spontaneous emission[电磁学]自发发射
词根:spontaneous
adv.spontaneously 自发地;自然地;不由自主地
n.spontaneity 自发性;自然发生
spontaneousness 自然;任意
1.No wonder they feel looser, more spontaneous, perhaps more assertive or funnier or blunter, in the language they were reared in from childhood.
难怪他们会觉得自己的语言更松散、更自然,或许会觉得自己从小学会的语言更自信、更有趣或更直率。