is not knowingis unknownis unawareis ignorantthat i don't knowis ignoranceam not sureweren't aware
chưa rõ
it is not clearunclearunknowndon't knowit is not knownnot surenot yet clearuncertainnot yet known
chưa được xác định
has not been identifiedhas not been determinedhas not been establishedis unknownyet to be determinedyet to be identifiedhas not been definedhas not been confirmedis undeterminedyet-to-be-identified
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