Orange, green, and purple are secondary colors.

Renewable energy sources such as wind and solar power are considered secondary energies.

Secondary drownings can occur hours after a near-drowning incident.

Secondary consumers play a crucial role in the food chain.

Many students attended secondary moderns in the 1960s.

Proteins are composed of primary, secondary, tertiary, and quaternary structures.

There are several secondary ports along the coast.

Secondary valences play an important role in chemical reactions.

Secondary phosphines are commonly used in organic synthesis.

Secondary works are important for understanding the primary source.