Seriously, I only have one pair of shoes because I only have one pair of feet.

说真的，我只有一双鞋，因为我只有一双脚。

youdao

What insects have one pair of wings? What insects have two pairs of wings?

什么昆虫有一对翅膀，什么昆虫有二对翅膀？

youdao

youdao

So if we take a look at nitrogen here, what you'll notice is we have thre available for bonding, - and we already have our lone pair -- one of our orbitals is already filled up.

如果我们看一下氮原子，我们注意到我们可以成3个键，我们已经有一个孤对-,其中的一个轨道已经被填满了。

麻省理工公开课 - 化学原理课程节选

Still more perplexing (to men, at least), these same women--after finally deciding on that one great pair--will head right back to the store 10 minutes after getting home to return them.

FORBES: Magazine Article

One boy-girl pair had been unable to talk at all.

NEWYORKER: Personal Best

With six bedrooms, the 1910 home also features an indoor basketball court, wine cellar, elevator, a one-bedroom au pair suite and top-level terraces with views of the San Francisco Bay and Golden Gate Bridge.

WSJ: Huguette Clark's New York Apartments Sell | Private Properties