spontaneity

例句：

1. 1. The child's spontaneity in playing with toys was infectious.
   孩子玩玩具时的自发性感染了周围的人。
2. 2. The scientist's research was based on the spontaneity of nature.
   科学家的研究是基于自然的自发性。
3. 3.The artist's work is characterized by its spontaneity and creativity.
   艺术家的作品以其自发性和创造力而著称。