Kosovo and Montenegro have adopted the euro unilaterally, but these countries do not officially form part of the eurozone and do not have representation in the European Central Bank (ECB) or in the Eurogroup.
科索沃和黑山两国单方面采用欧元，但并非为欧元区正式成员，在欧洲中央银行和欧元集团中无代表权。