intervene  
verb [ I ] uk/ˌɪn.təˈviːn/ us/ˌɪn.t̬ɚˈviːn/
  (GET INVOLVED)      
 C2 干涉,干预;调停
to intentionally become involved in a difficult situation in order to improve it or prevent it from getting worse
  The Central Bank intervened in the currency markets today to try to stabilize the exchange rate. 中央银行今天对货币市场进行了干预,试图稳定汇率。 
 [ + to infinitive ] The minister intervened personally to stop the museum from being closed. 部长亲自干预以阻止博物馆的关闭。 
 - More examples
 - There is increasing demand for the United Nations to intervene in trouble spots throughout the world.
 - I'd like to help but I don't have the power to intervene in this dispute.
 - The army's potentiality to intervene in politics remains strong.
 - Their only hope now is that the outside world will intervene but it is an increasingly forlorn hope.
 - The Bank of England intervened this morning to defend the pound .
 
  (COME BETWEEN)      
 发生于其间
to happen between two times or between other events or activities
  Two decades intervened between the completion of the design and the opening of the theatre. 从设计完成到戏院投入使用相隔20年。