Sentence examples similar to this third is from inspiring English sources

This third source is the president.

This third factor is the crucial one.

This third way is evolutionary game-theory.

The first is this elaborate altar.

The first is this.

This first appeal is specious.

This first thing is the roads.

This first study is a wonder.

This first V6 is, frankly, a disappointment.

This second outbreak is more serious.

This first version isn't perfect.