spontaneity
词根词缀：
instantaneity n. 立刻
instant 立即 + aneity 性质，状态 → 立刻
simultaneity n. 同时发生
simult 一样 + aneity 性质，状态 → 一样的时间发生 → 同时发生
spontaneity n. 自发
spont〔= spons承诺〕+ aneity 性质，状态 → 自发
数据来源：新东方英语词汇速记大全
相关例句：
On the Spontaneity and Consciousness of the Action Mechanism of Historical Law
论历史规律作用机制的自发性和自觉性
This work must have been done at the first jet, for it has a certain spontaneity.
这幅作品带有某种自发性，它一定是出于一时冲动而完成的。
Your spontaneity and confidence enable you to adopt a new healthy eating plan brimming with ideas and enthusiasm and your strength of character helps you to stick to the regime.
你的自发性和自信使你能够接受一个充满想法和热情的、新的健康饮食计划，你的坚强可以帮你坚持下去。
In the activity of history creation, there are two forms: spontaneity and self-consciousness.
人们创造历史的活动有两种形式：自发和自觉。
At the beginning period, the dis tant characteristics of Chinese ads market are spontaneity and disorder.
自发和无序，是中国广告市场初始阶段的显著特征。
He had the spontaneity of a child.
他有着孩童般的率性。