instrumentality的复数形式怎么写？

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.One that serves as a means; an...

instrumentality的音标：instrumentality的英式发音音标为：[ˌɪnstrʊmen'tælɪtɪ]instrumentality的美式发音音标为：[ˌɪnstrəmen'tælətɪ]...

n.手段...