combination primer造句

The case combination primer in the base of the powder case could be fired either electrically or by percussion.
At the combination prime-time speech and news conference at the White House Tuesday night, Bush rejected a suggestion that Iraq was becoming another Vietnam _ a quagmire without ready exit.
The combination primed the region for a disaster that began to unfold a week ago when fires _ some linked to arson _ began spreading through dense chaparral and forest, officials said.
It's difficult to find combination primer in a sentence. 用combination primer造句挺难的