rampancy

例句：

1. 1. The young man's rampant behavior was a source of concern for his parents.
   这个年轻人的放纵行为让父母很担心。
2. 2. The author's rampant criticism of the government raised eyebrows among readers.
   作者对政府的猛烈批评让读者们感到惊讶。
3. 3. The rampant crime rate has become a major concern for the city's authorities.
   猖獗的犯罪率已成为该市当局的主要担忧。