城牆是為了抵禦外敵而建造的。
The city walls were built to resist foreign enemies.
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Example sentences
面對外敵的入侵，全國上下必須團結一致。
面对外敌的入侵，全国上下必须团结一致。
Facing the invasion of foreign enemies, the whole country must unite.
Usage Notes
Refers to enemies or threats originating from outside one's country or group.
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