air attack

The fort cannot be defended against an air attack.

这座要塞遭到时无法防御。

North American Aerospace Defense Command (NORAD) - a binational command involving the United States and Canada which provides warning of missile and air attack against both of its member...

北防御指挥部-国和加拿大合指挥部，提供导弹发射和报，保卫北领，并提供中防御。