were swelling
Past progressiveconjugation ofswell.There are other translations for this conjugation.

swell

The vast majority of the population lived in major city centers which at this time were swelling in numbers.
La vasta mayoría de la población vivía en centros de ciudades importantes que en este tiempo estaban cre- ciendo en número.
The vibrational level that is now upon and within your planet has risen quite considerably and many of you were aware of the 'dangerous waters' that were swelling as the new current poured into your planet.
El nivel vibracional que está ahora sobre y al interior de su planeta se ha elevado considerablemente y muchos de ustedes estuvieron consientes de las aguas peligrosas se expandían mientras la nueva corriente se vertía sobre su planeta.
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