the last or most difficult challenge or area of exploration
последний или самый трудный вызов или область исследования (posledniy ili samiy trudniy vyzov ili oblast issledovaniya)
"For many scientists, space remains the final frontier."
"Для многих ученых космос остается последней границей." (Dlya mnogikh uchenikh kosmos ostaetsya **posledney granitsey**.)
to lose advantage or control in a situation
Someone who is too interested in other people's business.
to start sweating due to fear or anxiety
someone who is very social and enjoys meeting people
to criticize someone or something unfairly
to become more ill
