During the 20th century, the species' numbers underwent a dramatic decline for reasons that are not entirely understood.

A number of its doctors have undergone postgraduate training in the United States.

But a number of shops are undergoing restoration.

Most experts argue that domestication is not easy, because such a relatively small number of species have undergone it.

As of 2012, a number of vaccines were undergoing testing.

A small number of normal to moderately obese patients with type 2 diabetes have successfully undergone similar operations.

"I expect the number to undergo a sharp decline," Ben replied.

Many of the original homes still stand, with a number having undergone extensive renovations.

In 2006 and 2007, a number of the Entries underwent environmental refurbishment to improve their condition.

The numbers of humpback and fin whales had undergone similar increases.