en_tn/rev/04/05.md

flashes of lightning

Use your language's way of describing what lightning looks like each time it appears.

rumblings, and crashes of thunder

These are the loud noises that thunder makes. Use your language's way of describing the sound of thunder.

seven spirits of God

The number seven is a symbol of completeness and perfection. The "seven spirits" refers either to the Spirit of God or to seven spirits who serve God. See how you translated this in Revelation 1:4. (See: rc://en/ta/man/translate/writing-symlanguage)