narrow down

变窄

同：	[v.] nail down, narrow, peg down, specialise
反：	[v.] branch out, broaden, diversify

A narrow strip of wood used to fasten down the edges of the material that covers hatches in foul weather.
压板条:一种用来固定在恶劣天气下遮盖船舱口材料边缘的窄木条。收藏
After close observation for premonitory indications, the danger area is narrowed down, and the approximate scale and time of occurrence determined
在对预兆进行细心观察之后就把危险区缩小，并确定出地震发生的大概震级和时间。收藏
A multistage operation greatly narrows the residence time distribution and cut down this bypassing
多层操作可使停留时间分布大大地变窄，并截断短路。收藏

define clearly
- I cannot narrow down the rules for this game
[同] nail down, narrow, narrow down, peg down, pin down, specify
become more special
- We specialize in dried flowers
[同] narrow, narrow down, specialise, specialize
[反] diversify, branch out, broaden

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