in·ter·po·si·tion /-pəˈzɪʃən/
  插入中間,介入,干涉
  In·ter·po·si·tion n.
  1. The act of interposing, or the state of being interposed; a being, placing, or coming between; mediation.
  2. The thing interposed.
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  interposition
       n 1: the action of interjecting or interposing an action or
            remark that interrupts [syn: interjection, interpolation,
             interpellation]
       2: the act of interposing one thing between or among others