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.)
without proper planning, failure is inevitable
not allowed or beyond acceptable limits
to speak to someone as if they are less intelligent
to win by a very large margin
something attractive but not allowed or morally wrong
with honest intentions; sincerely
