1. a means or instrumentality for communicating. 
   用于联系的方法或手段。
2. an instrumentality invented for a particular purpose. 
   为了特定的目的而发明的工具。
3. The means or mode of acting; instrumentality. 
   手段行动的方法或方式；媒介
4. One that serves as a means; an instrumentality. 
   工具充当工具的东西；工具
5. He was able to locate his relatives through the instrumentality of the police. 
   靠警察的帮助，他找到了他的亲属。

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