unsolved problem是什么意思？

• juice
• toxicity
• passage
• 呼吁英语
• 局外人英文
• 流浪者英文
• volume
• cheese
• approaches
• scared
• 参数英文
• 抛弃英文
• client
• lycopene
• 旋律的英文
• lesson
• 导师英文
• 纪念品英语
• 解决方案英文
• candy
• default
• firmness
• giraffe
• fake
• tomato
• chess翻译
• disappointed
• erased
• pear
• passage

• tourist
• 队长的英文
• predict
• prompt
• PEGGING
• vehicle
• intermission
• 参与者英文
• sweater
• general
• fiercely
• 方案英语
• saturday
• bothering
• permitted
• banger
• modernize
• conflict
• 分配英文
• reveal
• silver
• brat
• front
• begins
• cloud
• committing
• repeat
• bombarded
• explore
• BARRIE

• liberal arts
• life cycle
• light bulb
• light court
• link to
• literary output
• living quarters
• lock system
• long johns
• lose consciousness
• love affair
• Lower World
• loyal to
• lubricating oil
• make an impact on
• make a tribute to
• make sketches of
• make way for
• marine scientist
• main subject
• maintain order
• major general
• make the difference
• mass production
• mass transportation
• massed movement
• medicine man