intractable problem是什么意思？

• lycopene
• mind
• volume
• panicked
• explore
• polite
• 参数英文
• juice
• satisfaction
• droplets
• disappointed
• general
• approaches
• crayon
• vehicle
• 纪念品英语
• various
• client
• intermission
• ticket
• PAXLOVID怎么读
• searches
• pear
• neck
• 实施英文
• autumn
• organizations
• erased
• ultra
• 方案英语

• sweater
• silver
• firmness
• giraffe
• algiers
• 局外人英文
• cheese
• dragon
• passage
• default
• 抛弃英文
• 确认英文
• tourist
• 来源英语
• 流浪者英文
• searches
• BARRIE
• failure
• candy
• lesson
• permitted
• general
• banger
• PEGGING
• emergency
• scared
• toxicity
• saturday
• profile
• narrow

• Quain
• Republic of Korea
• sarcoptic
• be launched
• micromilligram
• do great damage to
• material resources
• bomb release
• channel segment
• quadrupling
• phlebo
• Urodela
• minstra
• bevelled
• phillipsite
• create quite a stir
• time immemoria
• vertebral column
• Indifferent ground
• truncal