Şunu aradınız:: hayajulikani (Svahili - İngilizce)

ingawa sababu rasmi ya kifo cha mladenov ni "ajali ya barabarani," mengi hayajulikani katika tukio hilo.
although the official cause of mladenov's death is a "classic traffic accident," much remains unclear in the case.

mwanzo wa utengenezaji wa chanjo au dawa, mengi hayajulikani kuhusu usalama, sumu, hali ya dawa, na metaboli ya nce katika wanadamu.
at the beginning of vaccine or drug development, little is known about the safety, toxicity, pharmacokinetics, and metabolism of the nce in humans.