请你把中文翻译成为英文
不過，我要進一步指出，與去年在奧克拉荷馬城爆炸，他們說，這是一個硝酸鹽或肥料炸彈。
"However, I want to further mention that with the last explosion in Oklahoma City, they are saying that it was a nitrate or fertilizer bomb that did it.