back sb up是什么意思？

• approaches
• passage
• 参数英文
• tomato
• 抛弃英文
• toxicity
• 分配英文
• prompt
• PAXLOVID怎么读
• bombarded
• monitor
• narrow
• text
• 呼吁英语
• rice
• 导师英文
• repeat
• saturday
• autumn
• 旋律的英文
• neck
• ultra
• lycopene
• candy
• erased
• amazing
• algiers
• crayon
• intermission
• BARRIE

• failure
• silver
• explore
• aspect
• begins
• committing
• lake
• 方案英语
• tourist
• passage
• 领域英语
• dragon
• searches
• default
• general
• client
• 缺陷英文
• giraffe
• maths
• 参与者英文
• searches
• brat
• scared
• mind
• general
• peeping
• 来源英语
• emergency
• 流浪者英文
• sweater

• over the horizon
• over millennia
• originate from
• original version
• organic food
• or whatever
• operational mine
• open ended
• only that
• on various occasions
• on their way
• oblivion
• obtrusive
• orator
• pass up
• pay close heed to
• peace table
• peat bog
• penal colony
• per capita
• perform a role
• perform onstage
• periodic reversal
• persist in
• personal conferences
• perspective glass
• physical decay
• picture tube
• piece together