How to say we know very little about the cause of this disease. in Japanese
1)
このこの(kono) (n) this病気病気(byouki) (n,adj-no) illness/disease/sicknessのの(no) (prt) indicates possessive/nominalizes verbs and adjectives/substitutes for "ga" in subordinate phrases/indicates a confident conclusion/ indicates emotional emphasis/indicates question原因原因(gen in) (n,vs) cause/origin/sourceにに(ni) (prt) indicates such things as location of person or thing, location of short-term action, etc.ついてはついては(tsuiteha) (conj) in line with this/therefore/consequently/so/such being the case/in that regard/in this connection、、(、) Japanese commaほとんどわかってno dictionary result, likely a conjigated verbい(prt) strengthens a question, assertion, etc.ないない(nai) (aux-adj) not/emphatic suffix。。(。) Japanese period "."
