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》

I had cleared my desk before I left.

离开前我清理干净了办公桌。

《牛津词典》

Clean your desk before starting work.

工作前先清理桌面。

youdao

President Obama has said he hopes to have a health care bill on his desk before his State of the Union Address in January.

VOA: standard.2009.11.23

Please make sure you drop your library card at the front desk before you leave.

请确保在离开时，把图书卡放在前台。

have to 实战 - SpeakingMax英语口语达人

Missus Kennedy jumped up and grabbed Mister Kennedy. She called 'Oh,no!'" Before long,though, there were pictures, with Cronkite at his desk in the CBS newsroom in New York.

VOA: special.2009.08.16

She counted off four hundred-rupee notes, which she put down on the desk before Mr. Pai.

NEWYORKER: The Elephant

Bush urged the Senate to pass energy legislation and to have a bill on his desk before the August recess.

CNN: Bush urges more refineries, nuclear plants

In March of this year, he asked Congress to send him a bill to his desk before the new school year began.

WHITEHOUSE: Press Briefing