他们是极其幸福、无比般配的一对。用英语怎么说？

他们是极其幸福、无比般配的一对。

They were an extremely happy couple, ideally suited...

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

例句
He started eating an apple...
他开始吃苹果。

extremely

adv. 极端地，非常，很，去，绝；

例句
The rifle was extremely accurate...
这把步枪准头极高。

happy

adj. 幸福的，快乐的，巧妙的，〈口〉有点醉意的；

例句
As long as most people are happy to have the monarchy, the abolitionist position is an arrogant fantasy.
只要大多数人还乐意保留君主制，废除它的主张就是痴人说梦。

couple

n. 对，双，配偶，夫妻，<口>几个，两三个；vt.&vi. 连在一起，连接，成双，结婚，性交，交配；

例句
No-one personally acquainted with the couple was permitted to talk to the Press...
任何与这对夫妇有私交的人都不准和新闻界谈话。

ideally

adv. 完美地，理想地，观念上地，理论上地；

例句
They were an extremely happy couple, ideally suited...
他们是极其幸福、无比般配的一对。

suited

adj. 适合…的，合适的；v. 适合于（某人），适合，符合…的要求，合身，使适合；

例句
It's not really suited to absolute beginners...
它并不真正适合从零开始的初学者。