迅速蔓延

grow like a weed

1. 火势迅速蔓延。
   The fire spreads quickly.
2. 这种病正在迅速蔓延。
   The disease is spreading fast.
3. 这种疾病的迅速蔓延使医疗当局感到忧虑不安。
   The rapid spread of the disease is alarming the medical authorities.

速的英语翻译：

蔓延的英语翻译：