en_tn/1co/14/27.md

and each one in turn

"and they should speak one after another" or "and they should speak one at a time"

interpret what is said

This can be stated in active form. Alternate translation: "interpret what they said" (See: rc://en/ta/man/translate/figs-activepassive)

interpretation ... interpret

This means to tell what someone has said in a language to others who do not understand that language. See how "interpret" is translated in 1 Corinthians 2:13.