Many animal and plant species have been introduced by humans in two main waves.

The main waves of settlement came in the 17th century.

There were three main waves of French to the area in the 19th century.

We are lucky to have arrived ahead of the main waves.

Second Point is the main wave for high performance surfing.

There have been two main waves of municipalization in developed countries.

Looks like the main wave should hit shore starting about three hours from now.

The main waves occurred in 1947, 1970 and from 1990 until our present day.

The main wave of Russia's missile defense did not work.

After the main wave of gold rushes in the 1850s Chinese workers moved into the district.