be on duty是什么意思？

• theatre
• searches
• saturday
• amazing
• default
• 队长的英文
• droplets
• 来源英语
• 方案英语
• firmness
• explore
• permitted
• candy
• ultra
• banger
• toxicity
• failure
• intermission
• rice
• conflict
• cheese
• panicked
• lake
• BARRIE
• brat
• 旋律的英文
• mind
• 权限英文
• 造型的英文
• pear

• reveal
• monitor
• profile
• searches
• 分配英文
• vehicle
• general
• peeping
• tourist
• 局外人英文
• client
• fake
• approaches
• predict
• narrow
• 领域英语
• crayon
• maths
• general
• giraffe
• silver
• 参与者英文
• 参数英文
• prompt
• cloud
• scared
• algiers
• organizations
• 抛弃英文
• bothering

• heartbreak over
• high kick
• high performer
• high plains
• higher education
• hillbilly music
• hired hand
• hold in place
• home front
• honored with
• hook up
• horizon lines
• horse and cart
• hydraulic shield
• hydrogen cyanide
• jump out at
• keep at
• keep abreast with
• keep count of
• keep record
• key component
• keep on board
• keyboard instrument
• killer whale
• know better