translate English to French: Because Biosphere 2's glass roof admitted no ultraviolet radiation, the closed facility gave an opportunity to isolate biological sources and sinks of gases such as nitrous oxide.
Biosphère 2 a permis d'isoler des sources biologiques et des puits de gaz, par exemple l'oxyde de diazote, parce que son toit en verre bloquait le rayonnement ultraviolet.