I agreed, that this must be, indeed, a rare phenomenon.

Like others at other tables, he seemed high on a rare and lovely natural phenomenon.

In short, the thing we have is the real and perhaps rare political phenomenon of an occult government.

What had been a rare phenomenon is suddenly happening all over the world.

However, the precise nature of the conditions required makes them a very rare phenomenon.

He knew that it was an infinitely rare phenomenon, even at 62,000 feet.

The once rare phenomenon of having a country hit cross over to pop success became more common.

Further research by his group has shown that this is not a rare phenomenon.

Snow is a rare phenomenon in the area, perhaps a few times every century.

He'd heard of such a rare phenomenon but had never before witnessed it.