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慢性疾病每个月的治疗花销很容易达到2000美元--难怪有四分之一的美国人都治不起病。
本句的主干是Treatments...can...top $2，00O…，破折号后的内容则是对主句进行补充说明。one in four意为"四分之一"。
top在句中作动词，意为"达到，超过"，此外还含有"给……加顶；给……盖盖子"之意。如：
The workers are going to top the building tomorrow.
工人们打算明天给建筑封顶。
top作名词时，相关的短语很常见。如：
from top to bottom／from top to toe意为"从上到下，从头到脚；完全地"。如：
I know marketing from top to bottom.
我对市场营销了如指掌。
The stranger eyed me from top to toe.
陌生人从头到脚地打量着我。
The guitar player replayed the song from the top.
吉他手把这首歌从头开始又弹了一遍。
I don't want these boring things to get on top of you.
我可不想让这些烦人的事情缠住你。
Five people were crushed when the building collapsed on top of them.
那座大楼倒塌时把下面的五个人砸死了。
On top of borrowing a large amount of money, he asked us to lend him our car.
他向我们借了一大笔钱，此外还白我们借汽车。
1 was on top of the world when Mike proposed to me.
当迈克向我求婚时，我感到幸福极了。
