trace to its source是什么意思？

• aspect
• neck
• crayon
• juice
• 分配英文
• autumn
• client
• panicked
• various
• fake
• algiers
• disappointed
• modernize
• organizations
• lycopene
• intermission
• 纪念品英语
• 旋律的英文
• sweater
• vehicle
• conflict
• committing
• profile
• begins
• fiercely
• 确认英文
• 权限英文
• ultra
• toxicity
• brat

• polite
• 参与者英文
• bothering
• 队长的英文
• tourist
• reveal
• default
• approaches
• repeat
• 呼吁英语
• cloud
• 局外人英文
• 实施英文
• permitted
• peeping
• satisfaction
• giraffe
• theatre
• bombarded
• text
• 领域英语
• 方案英语
• narrow
• ticket
• chess翻译
• lesson
• 导师英文
• 造型的英文
• giraffe
• lake

• in confidence
• in conjunction with
• in connection with
• in consideration of
• in contrast to
• in control of
• in demand
• in depth
• in disguise
• in dispute
• in doubt
• in earnest
• in evidence
• in excess of
• in full
• in good conscience
• in good faith
• in good shape
• in harmony with
• in haste
• in kind
• in league with
• in luck
• in operation
• in order that
• in print
• in private