back-to-back + plural noun
作定语时放在名词前，名词通常用复数，表示事件一个接一个、没有间隔。
She has three back-to-back meetings this afternoon.
她今天下午有三个接连的会议。
背靠背的；后墙共用的；反向的；背向的；背对背
Happening one after another; consecutive.
连续的,接连的
Sequential or consecutive.
背对背
With one's back facing that of somebody else.
朝完全相反的方向出现
Emerging in exactly opposite directions.
后部共用墙的
Having a party wall at the rear.
The team won back-to-back championships last year.
该队去年连续赢得了两次冠军。
用法提示：back-to-back 作为形容词，表示“连续的”，修饰 championships，说明冠军是连续获得的。
I have back-to-back meetings all morning, so I won't be able to answer calls.
我整个上午都有连续不断的会议，所以无法接听电话。
用法提示：back-to-back 修饰 meetings，表示会议一个接一个，没有间隔。
The company reported back-to-back quarterly profits for the first time.
该公司首次报告了连续两个季度的盈利。
用法提示：back-to-back 修饰 quarterly profits，强调盈利是连续两个季度实现的。
作定语时放在名词前，名词通常用复数，表示事件一个接一个、没有间隔。
She has three back-to-back meetings this afternoon.
她今天下午有三个接连的会议。
作表语时表示背对背或后部相接，常与 with 连用说明相对的一方。
The two houses are back-to-back, sharing a rear wall.
这两栋房子背靠背，共用一堵后墙。
常与 win、play、lose 等动词连用，强调连续两次或多次取得或进行。
The team won back-to-back championships.
这支队伍连续赢得冠军。
grammar · medium
易错句子We had back to back meetings all morning.
正确表达We had back-to-back meetings all morning.
back-to-back 作定语修饰名词时通常要加连字符；不带连字符的 back to back 常表示“背对背地”，容易让读者理解成坐姿或方向，而不是“接连的”。
grammar · medium
易错句子The team played back-to-back two games in two days.
正确表达The team played two back-to-back games in two days.
英语中数量词 two 要放在形容词 back-to-back 前，构成 two back-to-back games；back-to-back 不能直接放在数量词前修饰后面的名词，这常受汉语“连续两场”词序影响。
grammar · medium
易错句子She has back-to-back meeting this afternoon.
正确表达She has back-to-back meetings this afternoon.
表示多场接连的会议时，back-to-back 修饰可数名词复数 meetings；汉语没有名词复数标记，容易漏掉词尾 -s。
consecutive 强调按顺序一个接一个、中间不断，常用于“数字+consecutive+名词”；back-to-back 更口语化，常指两场活动或比赛紧接举行，也可表示“背对背”，范围更广。
successive 较正式，强调同类事物一个接一个出现，可含“每一次”的意味；back-to-back 更强调中间没有间隔、密集发生，且口语更强。
straight 表示“连续”时多用于美式口语的“数字+straight+名词”，如 three straight wins；back-to-back 同样可表连续，但还常指背对背或后墙共用，不能在所有语境互换。
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