修建的目的是为了防御外敌的翻译：Is purpose built to defend against foreign enemies 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Built to defend against foreign enemies

Is purpose built to defend against foreign enemies

The construction goal is in order to defend the foreign enemy

The purpose is to build defense against foreign enemies

Is purpose built to defend against foreign enemies