1. Increased costs per cannon type to balance their firepower value. 增加的费用每大炮型平衡火力价值。
2. They were the elite flight squadron, chosen to protect the cannon. 他们是精锐的飞行中队，被选中保护着大炮。
3. He had never approached a cannon in his life, even at the Invalides. 他一生从不曾走近一尊大炮，即使是在残废军人院里。
英英解释
n.
1. a large artillery gun that is usually on wheels
2. heavy gun fired from a tank
3. (Middle Ages) a cylindrical piece of armor plate to protect the arm
4. heavy automatic gun fired from an airplane
5. lower part of the leg extending from the hock to the fetlock in hoofed mammals
6. a shot in billiards in which the cue ball contacts one object ball and then the other v.
1. make a cannon
2. fire a cannon
