Abstract and acknowledgements This introduction provides a glimpse of CercleS’ mission over the past 30 years, as clearly emerges in the contributions this issue contains. It is a Special Issue which celebrates the 30th anniversary of CercleS (1991-2021) and coincides with our being invited to become Editors-in-Chief of Language Learning in Higher Education, indeed a great honour for us. We would like to thank the present and past Executive Boards and Coordinating Committees for placing their faith and trust in us. We would also like to thank the authors who contributed to this special issue and the De Gruyter staff for their ongoing support. In this and future issues, we intend to carry forward the precious work of our predecessors, encouraging the CercleS community to continue to join forces in fostering best practices of modern language education both in Europe and the world at large.

中文翻译：

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庆祝CercleS：语言学习和教学领域30年专业活动的介绍性注释

摘要和致谢本简介简要介绍了CercleS在过去30年中的使命，这一问题所包含的贡献也清楚地体现了这一点。这是庆祝CercleS成立30周年（1991年至2021年）的特刊，恰逢我们受邀成为高等教育语言学习总编辑，这对我们来说确实是一项莫大的荣幸。我们要感谢现任和过去的执行局和协调委员会对我们的信任。我们还要感谢为这一特刊做出贡献的作者以及De Gruyter的工作人员一如既往的支持。在这个以及未来的问题中，我们打算发扬我们前辈的宝贵工作，