0 something by or through which an effect is produced -- prostředí
Air is the medium through which sound is carried.
1 a means (especially radio, television and newspapers) by which news etc is made known -- prostředek
2 a person through whom spirits of dead people are said to speak -- médium
I know a medium who says she can communicate with Napoleon.
3 a substance in which specimens are preserved, bacteria grown etc. -- prostředí
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.