Any of a series of chemically similar, radioactive elements with atomic numbers ranging from 89 ( actinium ) through 103 ( lawrencium ). 锕类任何化学性质相似, 原子序数在89 ( 锕 ) 与103 ( 铹 ) 之间变化的放射性元素.
我费尽口舌想避免一场打架。I tried to talk myself out of a fight.她小时候会和妹妹打架。As a child she fought with her younger sister.他们只知道打架，什么也不关心。They care for nothing but fighting....