intractable problem是什么意思？

• algiers
• pear
• 局外人英文
• organizations
• 呼吁英语
• failure
• silver
• searches
• profile
• text
• passage
• emergency
• searches
• panicked
• bombarded
• lake
• 队长的英文
• 流浪者英文
• permitted
• giraffe
• PEGGING
• theatre
• maths
• sweater
• chess翻译
• neck
• client
• erased
• lesson
• BARRIE

• 权限英文
• crayon
• 参数英文
• fake
• rice
• autumn
• general
• 方案英语
• aspect
• repeat
• various
• 领域英语
• banger
• cloud
• explore
• PAXLOVID怎么读
• 旋律的英文
• giraffe
• vehicle
• peeping
• fiercely
• 确认英文
• 实施英文
• front
• tourist
• prompt
• toxicity
• conflict
• droplets
• disappointed

• up to
• up to now
• upside down
• vacuum cleaner
• variety show
• very much
• vice versa
• wake up
• walk away
• walk out
• ward off
• warm up
• watch out
• wear down
• wear out
• what if
• what is more
• win over
• wind up
• wipe out
• with reference to
• with regard to
• work force
• work on
• work out
• work up
• worn out
• wrap up
• zip code
• abhors