jǐng / fāng / zài / zhōu / wéi / bù / zhì / le / míng / gǎng / àn / shào / fáng / zhǐ / yì / wài / fā / shēng

警方在周围布置了明岗暗哨，防止意外发生。

The police set up both overt and covert posts around the area to prevent accidents.