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**.)
The older you get, the wiser you become, due to experience.
an alternative plan if the first one fails
to suddenly fail or collapse
very happy and energetic
a network of computers infected with malware that are contro...
to break someone's confidence in you
