1. Any statesman is in part the prisoner of necessity.
   任何政治家都或多或少地是一些当务之急事情的俘虏。
2. We are now under the necessity of doing the work.
   我们现在必须做这工作。
3. She felt the necessity of accepting the invitation.
   她感到必须接受这一邀请。
4. New means must of necessity be had recourse to.
   人们必然求助于新方法。
5. Necessity is the mother of invention.
   需要是发明之母

　1个副词解释