I had cleared my desk before I left.

离开前我清理干净了办公桌。

《牛津词典》

I took the precaution of clearing out my desk before I left.

为了万全起见我离开前清理了我的桌子。

《柯林斯英汉双解大词典》

Before I left him, I sang him to sleep.

在我离开他之前，我唱歌哄他入睡。

youdao

"I studied English before I left home."

VOA: special.2010.07.25

I think that just it's a story that about his family before he left and sort of how he had a very happy, joyful life with his family.

我认为这个故事记录了,他离开日本前得家庭,以及他和家人的，快乐生活。

麻省理工公开课 - 媒体、教育、市场课程节选

"With all my heart, I urge you to pull up an anchor and make full sail before we lose the tide and are left stranded on the beach, exposed to the coming storms."

VOA: standard.2009.09.28

Before I left St Kilda, I cast a bottle adrift with a note of my own.

BBC: Cast away: five island paradises

Before I left on this trip, I spotted a few tulips peaking through at a garden in Berkeley Square.

FORBES: Culture Shock Abounds In Cool Techie London

It made a strong impression on me, and before I left I asked my friend who had painted it.

NEWYORKER: Nicole Krauss