All the materials are on site so that work can start immediately.

所有材料都已运抵工地，可以立即开工。

It is cheaper to have extra building work done when the builder is on site, rather than bringing him back for a small job.

趁建筑工人在工地上时叫他们完成额外的建筑工作要比叫他回来做一点小工便宜。

Do not smoke while you are on site.

不要当场吸烟。

On site interview.

在线面试。

It is assumed they will be on site and close by.

假设他们将在现场，离小组很近。