trading association的用法和樣例：
例句
- The owners of the coal mines had formed an association to protect their interests.
煤礦主們早組織了一個同業公會以保護他們自己的利益。 - After the completion of the transformation, the Trade Association losed its market foundation and withdrawed from the stage of history.
在社會主義改造完成之後，同業公會失去其存在的組織基礎與市場基礎，最終退出了歷史舞台。
