a moment of sudden discovery or realization
突然の発見や気づきの瞬間 (totsuzen no hakken ya kizuki no shunkan)
"He had a Eureka moment when he solved the equation."
"彼は方程式を解いたときにユリイカモーメントを経験しました。" (kare wa houteishiki o toita toki ni Eureka moment o keiken shimashita)
to achieve something gradually and steadily
someone who complains or cries easily
to continue progressing without slowing down
to be the first to report an important piece of news
to fail to do what one promised
a decision has not yet been made