instrumentality [ˌɪnstrəmen'tælətɪ]

例句:

• Without the instrumentality of a free press liberty could not be preserved.
  如果不能有效地利用新闻自由,就无法维护自由.
  
• Through the instrumentality of the police he was able to locate his relatives.
  靠警察帮忙,他找到了他的亲属.
  
• The Export - Import Bank is an instrumentality of the government.
  进出口银行是政府的一个执行机构.