tariff union的用法和樣例：
例句
- The formation of a customs union is one of those trade policy changes.
組成關稅同盟是貿易政策的一種變化。 - Since then he has slammed the door on the World Trade Organisation, opting instead for a no-doubt-mighty customs union with Belarus and Kazakhstan.
自此，他關上了世貿組織談判的大門，轉而選擇與白俄羅斯和哈薩克建立一個無疑是強大的關稅同盟。
