1.Russia has responded to the USA withdrawing from an arms treaty by announcing it has plans to build more missiles.
withdraw撤退;退出
The African National Congress threatened to withdraw from the talks.
非洲国民大会威胁要从会谈中退出 。
2.However, the paper omitted to mention the concept of M.A.D. - Mutually Assured Destruction.
omit 未(做)
She omitted to mention that they were staying the night.
她没说他们当晚要留宿的事 。