Once again he had to readjust to living alone.

他又一次不得不重新适应单独居住。

《牛津词典》

Once upon a time, a wealthy old man lived alone in a big house.

从前，一位富有的老人独自住在一所大房子里。

youdao

Once upon a time, people who lived alone tended to be those on either side of marriage—twentysomething professionals or widowed senior citizens.

曾几何时，独自生活的人往往是婚姻中的任意一方——或是包括20多岁的专业人士，或是丧偶的老年人。

youdao

He led her back to her room where she waited once more, alone with her thoughts.

VOA: special.2009.09.26

Cazeau once more ate dinner alone.

VOA: special.2009.06.27

Where CBS was once alone, it now faces a vast array of rivals who learned from the "tiffany" network's early success and have become adept at beating them at their own game.

FORBES: For CBS, Reality Bites

Federal regulators now touch areas of economic activity they once left alone, such as greenhouse-gas emissions.

ECONOMIST: The size of the state

Once they are alone, they wait for the prisoner to rise to her feet.

NPR: 'The Swallows of Kabul' Book Excerpt