The dictionary is exactly five times more expensive than that one.

这本字典比那本恰好贵5倍。

"A be 倍数 the 计量名词 of B "

The newly broadened square id four times the size of the previous one.

新扩建的广场是未扩建时的四倍大。

"The 计量名词 of A be 倍数 that of B "

The size of the newly broadened square is four times that of the previous one.新扩建的广场为以前的四倍大。

2.Those choices will involve, among a number of examples, cutting further programmes from the English schedule, reducing our distribution costs significantly, cutting parts of some services entirely, for instance, losing both the programming and distribution costs where short-wave audiences have become too small.

where short-wave audiences have become too small引导定语从句，修饰costs。

where引导定语从句修饰抽象名词的几种情况：

一、where定语从句修饰抽象名词point

You reach a point where medicine can’t help. 你已到了药物无法治疗的地步。

The crisis has reached a point where the receiver will have to be called in. 危机已达到非把破产管理人叫来不可的地步。

We have reached a point where a change is needed. 我们到了必须改一改的地步。

注：有时point也可以是具体的地点：