be in duty bound to是什么意思？

• juice
• explore
• general
• permitted
• 导师英文
• 抛弃英文
• passage
• cheese
• ticket
• rice
• committing
• maths
• crayon
• 纪念品英语
• 缺陷英文
• 造型的英文
• 呼吁英语
• autumn
• narrow
• lake
• disappointed
• organizations
• algiers
• searches
• volume
• client
• approaches
• firmness
• supper
• lesson

• failure
• 流浪者英文
• 参与者英文
• vehicle
• prompt
• reveal
• tomato
• profile
• candy
• predict
• sweater
• intermission
• bothering
• emergency
• default
• lycopene
• saturday
• modernize
• bombarded
• polite
• 参数英文
• giraffe
• giraffe
• 局外人英文
• fiercely
• 方案英语
• monitor
• toxicity
• brat
• begins

• Liz
• starlight
• stood
• straps
• seats
• adjustments
• comically
• fluffed
• Lenny
• UN
• elections
• Paramedics
• administering
• blows
• spent
• degenerated
• Leary
• posts
• administrations
• managers
• Beyton
• tells
• Hodges
• admired
• coped
• paintings
• admirers
• attracted
• Convictions
• steeply