U-bomb

例句：

1. 1. The U-bomb dropped on Hiroshima changed the course of history forever.
   在广岛投下的原子弹永远改变了历史。
2. 2. The atomic bombings in World War II were a major cause of death and destruction.
   第二次世界大战中的原子弹爆炸是死亡和破坏的主要原因。
3. 3. The development of nuclear weapons has raised ethical concerns about the use of U-bombs.
   核武器的发展引发了关于使用原子弹的伦理担忧。