n.[U][C]

1. （火山）爆發；（熔岩的）噴出
   There have been several volcanic eruptions this year.

   今年有好幾次火山爆發。

2. （感情等的）爆發；（戰爭、危機等的）突發
3. 【醫】發疹

n.

1. an act or instance of erupting.
2. a spot or rash appearing suddenly on the skin.