语法分析The Web has connected four hundred million Chinese to th

on a scale (that) difficult to predict 是定语从句。“difficult to predict ”是修饰“scale”的这个说法不对。首先作为定语从句,要有先行词,这里显然有--scale；再次,还要求做定语的成分是句子,这不是个完整句子,a scale (that) difficult to predict 缺了系动词,故若要还原应为 a scale that/which is difficult to predict difficult to predict 做scale后置定语,即省略 that/which is 是对的。a decade ago做 时间状语