en_tn_condensed/rev/10/03.md

Then he shouted

"Then the angel shouted"

the seven thunders spoke out

The thunder is described as if it were a person who could speak. AT: "the seven thunders made a loud noise" or "the thunder sounded very loudly seven times"

seven thunders

Thunder occurring seven times is spoken of as if it were seven different "thunders."

but I heard a voice from heaven

The word "voice" refers to words spoken by someone other than the angel. AT: "but I heard someone speaking from heaven" (See: rc://en/ta/man/translate/figs-synecdoche)