en_tn_lite_do_not_use/2ch/04/02.md

twenty cubits ... ten cubits ... five cubits ... thirty cubits ... each cubit

A cubit is 46 centimeters. Alternate translation: "9.2 meters ... 4.6 meters ... 2.3 meters ... 13.8 meters ... every 46 centimeters" (See: rc://en/ta/man/translate/translate-bdistance)

the round sea

This refers to a tank or basin that would hold water.

cast metal

This is metal that was melted then formed in a mold.

from brim to brim

"from one edge to the other"

in circumference

Circumference is the distance or measurement around a circular object or area.