1.backed by 由...支持
They're backed by allied warplanes and tanks.
他们受到盟军战机和坦克的掩护 。
2.second-in-command 二把手
That airstrike was aimed at killing al-Qaida's second-in-command, but he was not present at the time.
美军那次袭击行动的目的是消灭基地组织的二号人物,不过他当时并没有在村子里 。
3.air strike 空袭
A senior defence official said last night that they would continue the air strikes.
一位高级国防官员昨晚说他们将继续实施空袭 。
4.missile attack 导弹袭击
A missile attack by a US drone aircraft has killed at least 15 people in north-west Pakistan, officials say.
美国一艘无人战机在巴基斯坦西北部进行导弹袭击,造成至少15人死亡 。