There's only one seat so you'll have to sit on my lap.

只有一个座位，你只好坐在我腿上了。

《牛津词典》

I've been out of touch with most of my old friends, only one or two still drop me a line occasionally.

我已经和我的大多数老朋友失去了联系，只有一两个还偶尔给我写信。

youdao

Hello my one and only love, I miss you every day and can not even sleep.

您好，我唯一的爱，我每天都想念您，甚至不能睡觉。

youdao

The others in the room grew silent. I had knocked down one of their warriors with only my hand.

VOA: special.2010.07.17

Well, I might move my hands here 'cause this list only has one element left.

我会将手移到这边，因为这个列表中,只剩下一个元素了。

哈佛公开课 - 计算机科学课程节选

because I only just completed one of my courses to become a teacher,

因为我只学完了成为教师所需的一门课而已，

要继续努力 - SpeakingMax英语口语达人

You know, this is my one opportunity, you know, maybe my only one for the next year to sort of, you know, put forth my artistic persona, to, you know, embody whatever it is I imagine myself doing.

NPR: Joe Henry Is a Still Driving Man

Finally, this formed the basis of my one and only peer reviewed paper to date.

FORBES: For A Really Scary Story, Try This: Wall Street Just Doesn't Understand Washington

"This is my one and only chance to do something, " Ms. Brouwers said.

WSJ: Best High-School Pictures Ever