名詞 narrowing:

1. an instance of becoming narrow
2. a decrease in width
3. the act of making something narrower

動詞 narrow:

1. make or become more narrow or restricted
   同義詞：narrow, contract
2. define clearly
   同義詞：pin down, peg down, nail down, narrow down, narrow, specify
3. become more special
   同義詞：specialize, specialise, narrow, narrow down
4. become tight or as if tight
   同義詞：constrict, constringe, narrow

形容詞 narrowing:

1. becoming gradually narrower
   同義詞：tapered, tapering
2. (of circumstances) tending to constrict freedom
   同義詞：constricting, constrictive

1. The tunnel contract to a narrow passageway as you go deep.
   再往里走，坑道縮小成了一條窄窄的通道。
2. A narrowing of a mineral deposit, as in a mine.
   減少礦物沉積物的減少，如在煤礦中
3. The field of inquiry has narrowed down to five people.
   調查的范圍已經縮小到只剩5個人了。
4. They planed to narrow the gap between imports and exports.
   他們計劃縮小進出口的差額。