不认识认识

narrow down 英 [ˈnærəu daun] 　美 [ˈnæro daʊn]

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narrow down

phrase. 缩小；限制；减少；变窄　

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。

From your research and from recommendations, narrow down your choices to about three.　通过你的搜索及他人的推荐，从来把你选择的范围缩小到两三个。

1. 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。
2. From your research and from recommendations, narrow down your choices to about three.

通过你的搜索及他人的推荐，从来把你选择的范围缩小到两三个。
3. 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。