flat middle file passage平通管路
The Middle Passage重访加勒比;中间航程;中途航道;中部通道
N（名词） the journey across the Atlantic Ocean from the W coast of Africa to the Caribbean: the longest part of the journey of the slave ships sailing to the Caribbean or the Americas 大西洋中央航线; 旧时自非洲西海岸至加勒比的行程：奴隶船航行到加勒比或美洲的最长行程 [history]