customs union

名词 customs union:

1. an association of nations to promote free trade within the union and set common tariffs for nations that are not members

1. An economic union of Belgium, the Netherlands, and Luxembourg, originally established as a customs union in1948.
   比荷卢经济联盟比利时、荷兰和卢森堡的经济联盟，1948年作为一个关税联盟建立