yè / jiān / xún / luó / shí / bǎo / ān / shǐ / zhōng / bǎo / chí / jīng / tì / zhù / yì / zhōu / wéi / de / dòng / jìng

夜间巡逻时，保安始终保持惊惕，注意周围的动静。

While patrolling at night, the guard stayed alert and watched for anything unusual nearby.