when and only when是什么意思？

• explore
• banger
• searches
• passage
• BARRIE
• giraffe
• tourist
• 流浪者英文
• client
• 呼吁英语
• tomato
• chess翻译
• disappointed
• 来源英语
• dragon
• 分配英文
• lycopene
• searches
• panicked
• cheese
• 解决方案英文
• general
• committing
• front
• fake
• 纪念品英语
• mind
• theatre
• PAXLOVID怎么读
• supper

• autumn
• narrow
• begins
• predict
• satisfaction
• crayon
• 参数英文
• 方案英语
• erased
• prompt
• amazing
• general
• 参与者英文
• aspect
• 局外人英文
• ticket
• fiercely
• sweater
• reveal
• 导师英文
• peeping
• lesson
• text
• 抛弃英文
• permitted
• 缺陷英文
• ultra
• repeat
• 队长的英文
• conflict

• kyanophane
• work area
• good taste
• ninetieths
• nameless death
• poll parrot
• good humour
• soft tissue
• psychopathy
• auxiliary booster
• equi
• learn to read
• artificial flower
• portioning device
• axial cell
• A drink
• European fish
• wave beam
• swordman
• urinates
• Before dinner