narrow down
参考词典中narrow down的常规释义：
基本释义
- 变窄
英英解释
2个动词解释
- define clearly
[同] nail down, narrow, narrow down, peg down, pin down, specify
[例]- I cannot narrow down the rules for this game
- become more special
[同] narrow, narrow down, specialise, specialize
[反] diversify, branch out, broaden
[例]- We specialize in dried flowers
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