narrow down
减少, 限制, 缩小, 变窄
例句与用法：
The field of inquiry has narrowed down to five people.
调查的范围已经缩小到只剩5个人了。
The searching has narrowed down to a few streets where the gunman might be hiding.
搜查范围已经缩小到几条街，枪手很可能就藏在那儿。
The contest has been narrowed down to four competitors.
竞赛的范围已缩小到只剩下四个竞争者了。
词形变化：
形容词: narrowish | 副词: narrowly | 形容词比较级: narrower | 形容词最高级: narrowest | 名词: narrowness | 动词过去式: narrowed | 动词过去分词: narrowed | 动词现在分词: narrowing | 动词第三人称单数: narrows |
1. 变狭窄
The river has narrowed down over the past 20 years.
这条河在过去的二十年变窄了许多。
2. 减少; 缩小
Their demands had narrowed down to only two points.
他们的要求已减少到只有两点。