An American officer on the scene said no one had intruded into the space he was defending.

现场的一名美国军官说还没有人闯入过他所防卫的区域。

《柯林斯英汉双解大词典》

Accurate and timely information on space objects is vital for defending a satellite, but also necessary for attacking one.

对太空目标的准确而及时地信息对于保护卫星很重要，同样对攻击卫星也是必要的。

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"We are building new missiles that will be capable of defending not only against air-defense systems but space-based systems," Gen. Alexander Zelin said.

“我们正在研发新的导弹，将不仅能够保护防空系统，而且能够防卫以空间为基础的系统，”Gen . Alexander Zelin表示。

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Friday's successful advanced missile defense test, which shot down a mock nuclear warhead in space, shows that the US is getting closer to defending the country against ballistic missile attack.

CENTERFORSECURITYPOLICY: Center For Security Policy

Article V barred the development of the most efficient approaches to defending against long-range missiles (sea-, air- and space-based systems).

CENTERFORSECURITYPOLICY: Center For Security Policy

Jerome brought Birmingham back into the game when he found space to nod home James McFadden's cross at the back post but some poor defending meant Manchester City were soon two goals to the good again.

BBC: Man City 5-1 Birmingham