The European Union (EU) is the world's largest trading unit known as a customs union.
The European Union (EU) is the world's largest trading unit known as a customs union.
欧洲同盟（欧盟）就是关税同盟，是世界上最大的贸易单位。
The European Union (EU) is the world's largest trading unit known as a customs union.
欧洲同盟（欧盟）就是关税同盟，是世界上最大的贸易单位。