cannon

1. N-COUNT A cannon is a large gun, usually on wheels, which used to be used in battles. 大炮

The cannons boom, the band plays. 炮声隆隆，鼓乐齐鸣。

2. N-COUNT A cannon is a heavy automatic gun, especially one that is fired from an aircraft. 机关炮

Others carried huge cannons plundered from Russian aircraft. 其他人扛着从俄国飞机上抢来的巨型机关炮。

3. PHRASE If someone is a loose cannon, they do whatever they want and nobody can predict what they are going to do. 随心所欲的人

Max is a loose cannon politically. 马克斯是个在政治上随心所欲的人。