All types currently available use air as their primary form of insulation.

During the early 20th century, the automobile gradually became the primary form of transportation.

The farm serves as the primary form of income in the game.

Horses were still the primary form of individual transportation on the colony world.

The primary form of sense is touch, which belongs to all animals.

The primary form of transportation in Mimata is the car.

The given name is the primary form of address for Vietnamese.

But rap has been the primary musical form to use sampling.

Within the state, the primary form of transport is by road.

It is currently the primary form of liver disease among children.