Je was op zoek naar: hypothesis (Engels - Swahili)

hypothesis
nadhariatete

cousin and distant cousin hypothesis
nadhariatete ya ndugu na ndugu wa mbali

(note that this remains a hypothesis on our part)
(kumbuka kuwa hii ni nadharia tu kwa upande wetu)

rigorous scientific investigation has only just begun in the communities hit by the epidemic, and relatively few facts have been established, but scientists are coming up with what they believe to be a credible hypothesis.
uchunguzi zaidi wa kisayansi umeanza tu katika jamii zilozo adthiriwa na ugonjwa, na ukweli mchache kuanzishwa, lakini wanasayansi nwamezindua kile wanachokiamini kuwa wazo la kuaminika.