narrow down

基本解释

Of course, you still select the brand if you know it to narrow down the product list.
当然，如果您知道产品品牌，则仍可以选择该品牌来缩小产品列表范围。
You will have more cards than in the example above, and at this point you can possibly narrow down you subject further by taking out one of the piles of cards.
与上述例子相比，如果要写论文的话，你会持有更多卡片，在此时，通过剔除其中一个卡片堆，你就可以尽可能地进一步缩小你的主题范围。
Effective mechanisms for narrowing choices: If you are going to allow for a bit of competition, you have to have some way to narrow down the choices and make decisions.
缩小选择范围的有效机制：如果你允许有一些合理的竞争，你不得不通过一些方法缩小你的选择范围从而最终做出决定。

You narrow down until you're sensitive just to the language you hear.
你逐渐缩小敏感的范围,直到只对你所使用的语言敏感
耶鲁公开课 - 心理学导论课程节选
He also had the idea that he would make it narrow enough so that when you're boarding an airplane you can still roll it down the aisle of the airplane-- it just fit perfectly.
他还想到要将把手弄的窄一点,以便登机进通道的时候,还能拖着箱子走-,这非常符合当时的需要。
耶鲁公开课 - 金融市场课程节选
If I went on and told you what the different incident light was, and what the electrons were ejected with, and then you could look up the ionization energy for the particular different elements, you should be able to actually determine exactly which element it is, but just with the information given, we can only narrow it down to these choices here.
如果我继续告诉大家入射光源是什么，出射电子的动能是多少，那么你可以去查一查,以上各个元素的电离能，这样你就应该能确定,这个元素到底是哪个，但是只凭题目中的信息，我们只能把范围缩小至以上几种元素。
麻省理工公开课 - 化学原理课程节选

Starting with a plan begins to narrow down a large world of possibilities.
FORBES: Career Action Plan Off-Roading

If you narrow down a range of things, you reduce the number of things included in it.