It can be seen quite easily under experimental conditions.

A rainbow, however, may only be seen under certain conditions.

The cluster contains around 400,000 stars, and can be seen with the naked eye under good observing conditions.

This has primarily been seen under conditions of high nitrogen, which is not the usual state in a natural environment.

I have seen men fight under incredibly bad conditions.

I saw it under various conditions, over several days, and the range didn't seem all that great to me.

This planet can be seen with the naked eye under perfect conditions.

But the ballet may not have been seen under ideal conditions, for it got off to a mistimed start.

Later the same day we saw under more fit conditions the island of Taiaro.

He saw no evidence of recovery under present conditions.