I got trapped in one of those once.

Outside they could hear the roaring of engines as the once trapped planes continued to circle, seeking places to land.

Even time and light cannot escape once trapped in the black hole.

Once trapped in with green all around, a loved one is out of the game.

Once trapped in such a well, an atom tends to stay put, with its velocity greatly reduced.

In the nine long years he had been trapped on this world not once had he known such a moment.

He was trapped - more effectively than Morton had once trapped him.

Once trapped in the trade, women get pulled into a vicious circle from which escape is difficult.

I was trapped once in a basement, the day the first bomb fell.

Once trapped, an argon-39 atom appears as a bright dot on a sensitive video camera.