gap  
noun uk/ɡæp/ us/ɡæp/
  (HOLE)         
 B1 [ C ]缺口;豁口;裂口 
an empty space or opening in the middle of something or between two things
  The children squeezed through a gap in the wall. 孩子们从墙的一个缺口处硬挤了过去。 
 She has a small gap between her front teeth. 她的门牙之间有条细缝。 
 Compare: breach noun (OPENING) chink noun (CRACK)cleftcrack noun (NARROW SPACE)crannycrevicefissureinterstice opening noun (HOLE)slit nounslot noun (LONG HOLE)cavitychamber (SPACE) hole noun (SPACE)hollow nounpocket noun (GROUP/AREA)space noun (EMPTY PLACE)
 gap in the market C2 [ C ] 市场空白
an opportunity for a product or service that does not already exist
  There is a gap in the magazine market that needs to be filled. 在杂志市场上还有一个空白需要填补。 
 They'd observed that there was a gap in the market.
 She spotted a gap in the market while looking for upmarket vegan handbags.
 The gap in the beverages market for low-alcohol beer was swiftly being filled by new breweriest.
 They had been very successful in identifying a gap in the sportswear market for larger athletes.
 - More examples
 - A ray of sunshine shone through a gap in the clouds.
 - With a wriggle, she managed to crawl through the gap.
 - A gap in the clouds revealed the Atlantic far below.
 - He carefully nosed his lorry into the small gap.
 - A gap between the curtains admitted the faint glimmer of a street lamp.
 
  (DIFFERENCE)         
B2 [ S ]差距;分歧;隔阂 
a difference between two things
  The gap between rich and poor is still widening (= becoming greater). 贫富差距仍在继续拉大。 
 B2 [ C usually singular ](时间上的)间断,间隔,间隙 
a period of time spent doing something different
  After a gap of five years, Jennifer decided to go back to work full-time. 时隔5年之后,珍妮弗决定回去做全职工作。 
 - More examples
 - The government's change of policy is intended to reduce the gap between the haves and have-nots in our society.
 - We must strive to narrow the gap between rich and poor.
 - There exists nowadays a yawning gap between fashion and style.
 - We must bridge the gap between labour and management.
 - The report states that the gap between the rich and the poor has increased dramatically over the past decade.
 
Idiom   
bridge a/the gapidiom  弥合差距;弥补隔阂;消除差异
to connect two things or to make the difference between them smaller
  The president singled out education as a vital tool in bridging the gap between rich and poor. 总统先生首推教育为消除贫富差距的重要途径。 
 This collection of stories bridges the gap between history and fiction. 这部短篇小说集融合了历史和虚构文学。