en_tn/rev/18/02.md

Fallen, fallen is Babylon the great

The angel speaks of Babylon having been destroyed as if it had fallen. See how you translated this in Revelation 14:8. (See: rc://en/ta/man/translate/figs-metaphor)

She has become

The pronoun "she" refers to the city of Babylon, which is spoken of as if it were a prostitute. (See: rc://en/ta/man/translate/figs-personification)

refuge

Or "prison." This is an unpleasant place where the unclean spirits and birds can live and no one will bother them.

detestable bird

"disgusting bird" or "repulsive bird"