Direct measurement was the only way to solve the problem.

"Unfortunately, it may be decades before a direct measurement is possible."

A direct measurement of body fat is more valid, and though possible, it isn't commonly done.

I think more, independent and direct measurements are needed.

So far, direct measurements of the matter in our universe have been inconclusive.

However, direct measurement of this parameter is far more difficult in small cells.

Making direct measurements of the mass balance is simple.

This was the only direct measurement in relation to the cyclone.

But no direct measurement of the speed of light was possible with the accuracy required.

Brian also believed direct measurements should not play a significant role in the design process or evaluation of a loudspeaker.