In the way enrichment works, getting from 20% to bomb-usable 90% enrichment takes a lot less effort even than churning out the initial 3.5% reactor-grade stuff still piling up at Natanz.

Bored piles are hidden works, piling too many links, the quality of the construction process prone to accidents, we must attach importance to the entire process of construction quality control.

After the mid-17th century, Baroque-style church in Italy was all the rage, many of them new and original works, but also means clumsy, piling up over the building.