伦敦的Circle Line（环线）是伦敦地铁系统中一条历史悠久且重要的线路。它于1884年开通，最初由大都会铁路和区域铁路联合运营，形成了一条环绕伦敦市中心的环形线路。这条全长约27公里的线路以其标志性的黄色标识闻名，连接了伦敦市中心的多个重要交通枢纽和地标。

Mix as in mix and mingle, join and become part of a large group. To be in the mix, then, is to be included. Hence, ...

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