0 a boundary between countries -- hranice; pohraniční
We crossed the frontier
(also adjective) a frontier town.
1 the farthest area of land on which people live and work, before the country becomes wild and deserted -- pohraničí
Many families went to make a new life on the frontier.
2 the limits or boundaries (of knowledge etc) -- hranice
the frontiers of scientific knowledge.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Můžeme to dokončit krok za krokem, ať je cesta jakkoli dlouhá, a nelze ji dokončit, ať je cesta jakkoli krátká, pokud si ani neoznačíte svou stopu.