en_tn_condensed/exo/26/25.md

silver bases

These were silver blocks that had a slot in them to keep the frame in place. See how you translated this in Exodus 26:19.

in all

"total"

and so on

This means that what was said about the first two frames should be done for the rest of the frames. See how you translated this in Exodus 26:21. Alternate translation: "and two bases for each of the rest of the frames" (See: rc://en/ta/man/translate/figs-explicit)