national defence ( 英 ) 或 defense ( 美 )

guard against

fire fighting

set up defences ( 英 ) 或 defenses ( 美 ) ( pt , pp set )

border defence ( 英 ) 或 defense ( 美 )

defence ( 英 ) defense ( 美 )

defend

guard against ⇒ 防备敌人偷袭 fángbèi dírén tōuxí → guard against surprise attacks by the enemy ⇒ 防备火灾 fángbèi huǒzāi → take precautions against fire

defend ⇒ 修筑防御工事 xiūzhù fángyù gōngshì → construct defences ( 英 ) 或 defenses ( 美 )

protect

⇒ 防暴警察 fángbào jǐngchá → riot police

prevent ⇒ 防止疾病扩散 fángzhǐ jíbìng kuòsàn → prevent disease from spreading

prevent and cure

air defence ( 英 ) 或 defense ( 美 ) ⇒ 防空导弹 fángkōng dǎodàn → air defence missile

line of defence ( 英 ) 或 defense ( 美 )

keep a lookout ( pt , pp kept )

defend oneself

prevent

suddenly

be unable to defend

nip in the bud

take preventative measures