问题描述：
it的指代,what从句
Since Bruce Li first one-inch punched his way onto Western screens,the definition of what it means to be a martial arts movie star has been evolving.自从李小龙踏入西方影幕第一步,作为一个武术电影明星的定义已有所发展.这事我从2008年4月23号的21世纪报上抄的一句话,想重点提问“the definition of what it means to be a martial arts movie star”这个部分,请问it指代谁?what在从句中充当什么成分?以及这句话的确切意思?请高手从语法角度透彻的分析一下,
Since Bruce Li first one-inch punched his way onto Western screens,the definition of what it means to be a martial arts movie star has been evolving.自从李小龙踏入西方影幕第一步,作为一个武术电影明星的定义已有所发展.这事我从2008年4月23号的21世纪报上抄的一句话,想重点提问“the definition of what it means to be a martial arts movie star”这个部分,请问it指代谁?what在从句中充当什么成分?以及这句话的确切意思?请高手从语法角度透彻的分析一下,
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