jǐng / fāng / zài / rù / kǒu / chù / shè / zhì / jǐng / jiè / fáng / zhǐ / wú / guān / rén / yuán / lán / rù / huì / chǎng

警方在入口处设置警戒，防止无关人员阑入会场。

The police set up a guard at the entrance to prevent unrelated people from entering the venue.