国家有义务保护本国公民不受外敌侵犯。

The state has a duty to protect its citizens against external enemies.

《牛津词典》

边境沿线均构筑了堡垒，以防外敌进攻。

A line of forts was built along the border, to protect the country against attack.

youdao

这个国家从未被外敌征服过。

The country has never been conquered by a foreign foe.

youdao

此外，克兰诺格也比较便于抵御外敌进攻。

Also, they were probably easy to defend against attacks.

youdao

他们的职责是保卫国家不受国内外敌人的侵害。

Their duty is to defend their country against both domestic and foreign enemies' attack.

youdao

他们的职责是保卫国家不受国内外敌人的侵害。

Their duty is to defend their country against both domestic and foreign enemies' attack.

youdao