Translation of "Supplement" in Spanish

My father reared goats to supplement the family income.

Mi padre criaba cabras para complementar el ingreso familiar.

So to supplement our knowledge and understanding of this phenomenon,

Para complementar nuestro conocimiento y entender este fenómeno,

Then that can supplement what we say with our words.

y eso complementa nuestras palabras.

But they have a grizzly way to supplement their diet. They're carnivores.

Pero tienen una forma macabra de complementar su dieta. Son carnívoras.

There is a 25 euro supplement for the high speed AVE train.

Hay un suplemento de veinticinco euros para el AVE.