nagi płomień

Good God, I've never seen a naked flame in my life.

"A Schwarzschild hole is like a naked flame," he went on.

There's a lot of stuff in a lab that shouldn't be exposed to a naked flame.

I've not seen a naked flame on anything bigger than a cigar lighter since I got here.

How many of you have ever seen a naked flame?

These explosions, caused by using naked flame for lighting, killed seventy-five men.

The two words burned like naked flame into his heart.

Mr Tulip, after all, wasn't a man you'd want to see standing too close to a naked flame.

It probably wouldn't be a good idea to employ a naked flame any nearer to the pit.

All are flammable, though, and this experiment should be performed with no naked flames in the lab.