It is impossible to defend against an all-out attack.

防御全面进攻是不可能的。

《牛津词典》

A family must defend its home against attack.

一个家庭必须保护其不受袭击。

youdao

There is also a castle in Europe with defenses set to defend against an attack from the inside out.

欧洲还有一处城堡其防御设施是用于防御来自地内的攻击。

youdao

He stopped moving forward and prepared to defend against what seemed to be a strong Confederate attack.

VOA: special.2009.08.27

Defense Minister Ahmed Vahidi says the Sejil 2 is intended to defend the country against outside attack.

VOA: standard.2009.12.18

Christophe Duverne, a spokesman for NXP, told Reuters that it would take months or years for some users of the chip to adapt their systems to defend against the attack.

BBC: Oyster cards, PA

The comprehensive capability to defend against ballistic missile attack inherent in a space-based SDI is utterly incompatible with the concept of strategic vulnerability to such attack enshrined in that 1972 accord.

CENTERFORSECURITYPOLICY: Hapless SDI damsel in distress: Awaiting a hero

The US's EMP commission's report explained that to defend against such an attack, it is necessary to build redundant electrical systems and have difficult-to-build replacement parts like turbines on hand to replace ones destroyed by such an attack.

CENTERFORSECURITYPOLICY: An urgent memo to the next government