Her husband, a scaffolder, is working on a building site in Saudi Arabia and sending money home.

她的丈夫是一个脚手架工人，现在在沙特的一个建筑工地工作，赚钱寄回家里来。

youdao

I was working as a foreman on a building site.

我在一个建筑工地当工头。

《柯林斯英汉双解大词典》

If you love building things, maybe you should consider a hobby like working on older cars or building furniture.

如果你喜欢制造东西，也许你应该考虑培养一个爱好，比如修理旧汽车或制造家具。

youdao

The subway only has two lines, though, and is currently working on building a third.

BBC: Subway systems by the numbers

The Baltic states and Poland are also working on building a new nuclear power plant in Lithuania.

BBC: NEWS | Europe | Baltic states in EU energy tie-up

He is working on building a gym facility in North Carolina.

WSJ: Dale Katechis of Oskar Blues Brewery Mixes Exercise With Beer