The cannon and the mortar are not only much dearer, but much heavier machines than the balista or catapulta; and require a greater expense, not only to prepare them for the field, but to carry them to it.

大炮和迫击炮不仅比弩炮或弹弓更贵，而且也更重；并且需要更多的费用，不仅是为了让他们为战场做好准备，而且还要将他们带到战场上。