/ˌæmjuˈnɪʃn ||; ˌæmjəˈnɪʃən/noun [U]:
1 the supply of bullets, etc that you need to fire from a weapon 弹药: The troops surrendered because they had run out of ammunition. 军队用完了弹药，所以投降了。
2 facts or information that can be used against sb/sth 可用来攻击某人或某事的材料