This has been a troubling phenomenon to all sitting governments and one which becomes hotly debated leading up to the nations' elections.

Federal regulators said they were trying to determine whether other aircraft have exhibited the same troubling phenomenon.

Arsalan Iftikhar, the group's legal director, asked Defense Secretary Donald H. Rumsfeld to "investigate this troubling phenomenon and do whatever is necessary to bring it to an end."

But the case, and the international attention it drew, threw light on a troubling phenomenon: the modern slave trade.

Or they may cite a wide range of troubling phenomena, of which we're already dimly aware but had not considered symptoms of the same fundamental crisis: It's all due to our loss of commitment!

My focus was on a troubling phenomenon often referred to as the "decline effect," which is the tendency of...

But the woman heading the new government team to investigate child rape has no doubt that it is an increasingly troubling phenomenon.

I believe that this practice of shifting justifications has much to do with the troubling phenomenon of many Americans questioning the administration's motives.

My focus was on a troubling phenomenon often referred to as the "decline effect," which is the tendency of many exciting scientific results to fade over time.

The sale of our public institutions on the other hand is a new and deeply troubling phenomenon.