警察一到现场，人群便四散离去。

The crowd soon dissipated when the police arrived.

youdao

在2003年利比里亚内战，他的两名记者一到现场叛军线。

In the 2003 Liberian Civil War, he was one of two journalists to live behind rebel lines.

youdao

我们想了好多套方案来给窗户抹胶（gel the window），但我们一到现场就觉得这些伎俩都没必要用了，因为摄影机的曝光宽容度比我想象的要强很多。

We had a lot of plans about how to gel the windows, but once we got in there, I didn't need to use all of those tricks because the camera had more dynamic range than I expected.

youdao