Every node has one and only one primary node type.

每个节点都有且只有一个主节点类型。

youdao

Each ID should be a member of one and only one group.

每个ID应该为一个且仅一个组的成员。

youdao

Each XML document contains one and only one root element.

每个XML文档都有且只有一个根元素。

youdao

But one activity that legally is only supposed to be for people age twenty-one and over is drinking alcohol.

VOA: special.2009.08.07

Is there a Nash Equilibrium In which one and only one candidate stands?

有且只有一个,候选人参选是纳什均衡吗

耶鲁公开课 - 博弈论课程节选

I've only been to one basketball game, and I think it was a New York Knicks against someone -

我仅仅看过一场篮球赛，当时好像是纽约尼克斯队和某个队的比赛。

麦迪逊广场花园 - SpeakingMax英语口语达人

Being forced to work at one and only one company is a different matter though.

FORBES: Forced Internships at Apple's Foxconn?

Yeah, you got it: The CFTC thought that there was one and only one Yunusov, and that was Marat, who also used the name of Ayrat.

FORBES: One Russian Commodities Fraudster Turns Out To Be Twin Brothers

One and only one downturn turned into a Great Depression.

FORBES: Bumbling Bernanke Bamboozled By Broken Bounce-back