谁能帮我分析一下这个句子的成分,还有 句中的where可不可以用that代替? The expansion of desert like conditions into areas where they did not previously exist is called desertification 主要是句子的前面那部分不是很了解
The expansion of desert is called desertification 主句 like conditions into areas 状语 where they did not previously exist定语修饰areas ,不可以用that,where是副词,专门指地点