Rust was their primary component, at least in the area of the train station.

This may cause the secondary to acquire enough mass to become the primary component.

The following are the primary components a developer would interact with.

Health education is a primary component of every program.

Each is named for the primary component of its environments.

It also is a primary component of a horse harness.

The primary components of the program are training, certification, and community.

"But exploration has not been a primary component of our policy for many years."

"What, may I ask, is the primary component of your policy?"

The Builder is the primary component and main application of the system.