in the process of producing terebinth and colophony, it「s difficult to measure the amount of terebinth in the turpentine on line, but it」s the key to realize automatic control for the whole process.
now the angel of the lord came and sat under the terebinth at ophrah, which belonged to joash the abiezrite, while his son gideon was beating out wheat in the winepress to hide it from the midianites.