an obvious truth
明白な真理
An occasional beer is my only indulgence.
たまにビールを飲むのが唯一の道楽です
an occasional gleam of intelligence
折にふれてひらめく知性
an occasional mistake
たまたま犯した誤り
an occasional thunderstorm
時々来る雷雨
an occupational counselor
就職指導員
an occupational disease
職業病
an occupational hazard
職業上の危険
an occupational [a company] pension scheme
企業年金制度
an ocean [a lake] basin
海盆[湖盆]