train something on something
train something at something

Training the light on the wall she discovered a small door.

He has been training on his own only since December 1995.

You must train on your own for at least ten minutes a day.

Right now his cold blue eyes were trained on the road.

I'm not quite sure when I will be able to train on it again.

They looked like people with a gun trained on them.

His eyes, trained on her the whole time, were cold.

So, what is life like with a camera trained on every move?

He trained his attention on the door of the third room down the hall.

I still had my gun, it was trained on him.