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。

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Twitter, the popular microblogging site, was out of service much of the day Thursday as it worked to defend itself against a Web attack, but service appeared to have been restored by late evening.

这个广受欢迎的微博客网站，在星期四的大部分时间里停止服务，它其实是在抵御一场网络攻击，但当天晚间服务得到了恢复。

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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