He snapped open his briefcase and then began to read.

问题描述:

He snapped open his briefcase and then began to read.
意思是:他啪的一声打开公文包,然后开始读起来。
这里 snap 和 open 都是动词吧?为什么连用了呢?

snap是动词,open是副词,是啪的一声打开来(而不是关上)