spontaneous change

例句：

1. 1. The spontaneous change in the weather led to a cancellation of the outdoor event.
   天气的自发变化导致户外活动取消。
2. 2.The company's decision to make a spontaneous change in its strategy was met with mixed reactions from employees.
   公司决定对其战略做出自发改变，员工的反应不一。
3. 3.The spontaneous change in the economy has affected everyone's daily routines.
   经济的自然变化影响了每个人的日常生活。