at the news they all jumped with joy

问题描述:

at the news they all jumped with joy
这里的at 是怎样一个新用法
表示一听到?
固定用法吗?

at 表示,看到,听到,想到 等,含有 因为的意思.
比如We felt happy at the sight of the flower.
He screamed at the snake.