union ·noun (REPRESENTATIVE ORGANIZATION)
Definition: an organization that represents a group of people who do a particular job or who have the same goals Level: B1
许多教师属于专业工会，以改善工作条件。
Many teachers belong to a professional ___union to improve their working conditions.
美国公民自由联盟在保护个人自由方面起着关键作用。
The American Civil Liberties ___Union plays a key role in protecting individual freedoms.
他作为代表积极参与了学生会。
He was actively involved in the school student ___union as a representative.