expulsion

n.

1. 喷出, 排出
   • The expulsion of dust from the volcano was visible from miles away.
     火山喷出的灰尘几英里之外就能看得见。
2. 开除, 驱逐
   • His bad behaviour resulted in his expulsion from school.
     他的不良行为导致他被学校开除了。