the last or most difficult challenge or area of exploration
最後または最も難しい挑戦または探査領域 (saigo mata wa mottomo muzukashī chōsen mata wa tōsaryōiki)
"For many scientists, space remains the final frontier."
"多くの科学者にとって、宇宙は最後のフロンティアであり続けています。" (ōku no kagakusha ni totte, uchū wa **saigo no furontia** de ari tsuzuketeimasu.)
a person who leaves home and returns repentant after wasting...
to increase rapidly; to become very high
to continue with progress after a delay or challenge
to start something, especially a project or task
to be in agreement or share similar thoughts or goals
to be able to think of interesting and unusual ideas
