We were walking in single file to the lake.

我们排成单行走向湖边。

《柯林斯英汉双解大词典》

They made their way in single file along the cliff path.

他们一个接着一个沿悬崖小径前进。

《牛津词典》

Run a project or a single file.

运行一个项目或一个文件；

youdao

About 500m in, it started to narrow, forcing us into single file as it scythed upwards.

BBC: How Iceland��s baby volcano was born

Since he keeps his documents online, his paper files now occupy a single file drawer.

WSJ: Warming Up to the Officeless Office

Inspector SEVILLA: It's basically just trying to keep them in a straight single file.

NPR: When the Elephants March in Manhattan