narrow down
US
UK narrow [sth] down, narrow down [sth] vtr phrasal sep: (possibilities: limit)
SC 缩小...的范围
Giving the police as detailed a description as you can of the mugger will narrow down their search.
尽可能详细地向警方描述抢劫犯的样子，可以帮助警方缩小搜寻范围。
narrow [sth] down to [sth], narrow down [sth] to [sth] v expr: (possibilities: limit to [sth])
SC 把范围缩小到
SC 局限在
When choosing a college, it is important to narrow down your options to only three or four colleges.
选大学的时候，将你的选择范围缩小到三到四所大学非常重要。