wèi / què / bǎo / huó / dòng / ān / quán / gōng / zuò / rén / yuán / tí / qián / zài / huì / chǎng / zhōu / wéi / bù / kòng

为确保活动安全，工作人员提前在会场周围布控。

To ensure the event is safe, staff set up surveillance around the venue in advance.