ammunition
n. 弹药，军火；（批评或辩论中攻击他人的）把柄，证据
例句
We only have three rounds of ammunition left.
我们只剩下三发子弹了。
《牛津词典》
He had only seven rounds of ammunition for the revolver.
他只有7发左轮手枪的弹药。
《柯林斯英汉双解大词典》
In the meantime, the boys, having used all their books, looked around for new ammunition.
与此同时，男孩们扔完了所有的书，四处寻找新的弹药。
