0 a drug that makes the blood vessels (= any of the tubes through which blood flows in the body) narrower, and that therefore raises the pressure at which the blood flows --
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.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.