We've had the chance to observe it, under various conditions, for almost two weeks.

Such confidence could only be confirmed by observing his mind under stress.

The one who had reported her stood a little apart from the others, as if observing a detail under his command.

Observed the dark wet patch under the arms of his light blue shirt.

Also we observed several groups of men under guard.

Marshall observed the inner side of his hands while still under observation by people all around him.

These have half lives ranging from a fraction of a second to a few days, so they are only observed under laboratory conditions.

Molecules are far too small to be observed under a microscope like cells.

When the solution was cooled, he observed the results under a microscope.

The female penguins observed under the study were coupled with males.