OET interlinear REV 10:7

uW Translation Notes:

Note 1 topic: figures-of-speech / parallelism

ἀλλ’ ἐν ταῖς ἡμέραις τῆς φωνῆς τοῦ ἑβδόμου ἀγγέλου, ὅταν μέλλῃ σαλπίζειν

(Some words not found in SR-GNT: Ἀλλʼ ἐν ταῖς ἡμέραις τῆς φωνῆς τοῦ ἑβδόμου ἀγγέλου ὅταν μέλλῃ σαλπίζειν καί ἐτελέσθη τό μυστήριον τοῦ Θεοῦ ὡς εὐηγγέλισεν τούς ἑαυτοῦ δούλους τούς προφήτας)

These two phrases mean similar things. The angel is using repetition to emphasize the idea that the phrases express. If it would be helpful to your readers, you could combine them. Alternate translation: [but in the days when the seventh angel is going to sound a trumpet]

Note 2 topic: figures-of-speech / possession

τῆς φωνῆς τοῦ ἑβδόμου ἀγγέλου

˱of˲_the voice ˱of˲_the seventh angel

This possessive form does not describe what the seventh angel sounds like. Instead, it describes a sound that the seventh angel will make. Alternate translation: [when the seventh angel makes a sound]

Note 3 topic: figures-of-speech / idiom

ἐν ταῖς ἡμέραις τῆς φωνῆς

in the days ˱of˲_the voice

The angel is using the term days idiomatically to refer to a specific time. If it would be clearer in your language, you could state the meaning plainly. Alternate translation: [at the time of the sound]

Note 4 topic: figures-of-speech / activepassive

ἐτελέσθη τὸ μυστήριον τοῦ Θεοῦ

˓was˒_finished (Some words not found in SR-GNT: Ἀλλʼ ἐν ταῖς ἡμέραις τῆς φωνῆς τοῦ ἑβδόμου ἀγγέλου ὅταν μέλλῃ σαλπίζειν καί ἐτελέσθη τό μυστήριον τοῦ Θεοῦ ὡς εὐηγγέλισεν τούς ἑαυτοῦ δούλους τούς προφήτας)

If your language does not use this passive form, you could express the idea in active form or in another way that is natural in your language. Alternate translation: [God will accomplish his mystery]