It was practical books about fortifications, hydraulics, artillery, navigation, and shipbuilding.
而是实际的书籍,比如有关防御工事的,水力学,炮术,航海和造船的
You have to have people who live in these fortifications.
在这些防御工事中必须有人驻扎
These were not defended. Your farmland was not defended.
没有防御工事,你的农场都是不设防的
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