在无穷黑暗中，我将用疯狂的智慧点燃宇宙的火焰！if函数多个条件怎么用

　　In Victorian England, an American showman uses a wealthy Frenchman's finances to build a German explosives expert's giant cannon designed to fire a people-filled projectile to the Moon, but spies and saboteurs endanger the project.