-fens-

打击
defense

= defence

[Defense](美国)国防部

defensive
[diˈfensive]

adj. 防御的,守势的
n. 防御手段,防势

offense

= offence 

offensive
[əˈfensiv]

adj. 冒犯的,攻击的;讨厌的
n. 进攻,攻势