unknown background是什么意思？

• predict
• general
• 参数英文
• ultra
• 实施英文
• committing
• client
• lake
• giraffe
• ticket
• crayon
• aspect
• 领域英语
• cloud
• 长颈鹿英语怎么说
• pear
• BARRIE
• lesson
• polite
• begins
• text
• droplets
• various
• 造型的英文
• explore
• erased
• 方案英语
• 旋律的英文
• supper
• emergency

• peeping
• rice
• vehicle
• toxicity
• 流浪者英文
• giraffe
• neck
• autumn
• mind
• volume
• juice
• organizations
• passage
• maths
• 局外人英文
• scared
• general
• 抛弃英文
• 确认英文
• failure
• searches
• algiers
• theatre
• lycopene
• monitor
• front
• approaches
• narrow
• repeat
• searches

• sporophore
• make a wish
• thieves and brigands
• misspoke
• swather
• polaris
• quite a while
• The Picnic
• rest with
• idioms and allusions
• worthless stuff
• pawnshop
• or natural
• make waves
• facial expression
• writing brush
• ritziest
• in intaglio
• fell for
• pull a face
• nonvalent
• principal food
• mastoidealgia
• angle of elevation