They're studying practical things like marble work, and metal work, and copper work, and not just shipbuilding.
他们学习一些实用的东西,比如大理石打磨,金属冶炼和铜器制造,并且不仅仅是造船术
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
He learned shipbuilding there as well.
他在那里学了造船
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