长难句仿写：

原句：

That would make it almost five times as long as all other high-speed rail networks in the world combined.

（中国交通运输部门计划在未来15年扩建近一半长度的高铁，达到70 000 km。)

那个长度将是其他国家高铁总和的近5倍。

#这里是as …as引导比较状语从句。第一个as为程度副词，第二个as为从属连词，引导从句。

精简 That would make it as long as all other rail networks combined.

主句 That would make it long.

从句 [All other rail networks combined] are long.

合起来 That would make it as long as

all other rail networks combined (are long).#省略as...as中间的adj，一般省略从句系动词

从句 [All other rail networks (that are) combined] are long.

这个combined是过去分词做后置定语，修饰主语，表达的是被动，意思是合起来的，相当于that are combined.

## The total mass of farmed chickens exceeds that of all other birds on the planet combined.

## 另一个例子: This tree is three times as tall as that one. 这棵树是那棵树的三倍高。

This tree is three times tall.

That one is tall.

合并: This tree is three times as tall as that one (is tall).#省略as...as中间的adj，一般省略从句的动词

不理解：怎么不明确？

类似的之前讨论过的

你可以把它判定为as引导限制性定语从句也可以是比较状语从句

因为目前第二个as界限不明确