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。

youdao

Practical Books are the ever-burning lamps of accumulated wisdom.

实践的书是累积智慧永不灭的灯。

youdao

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

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Unfortunately, there is no practical way for me to rip my books.

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From their books to their blogs, their philosophy of providing simple, user-friendly software and practical business-building strategies is woven into every product like DNA strands.

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In practical terms, that means iPad-controlled seating charts, web-based guest lists and look-books delivered almost instantaneously after each show.

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