0 the thin yellowish liquid part of the blood : --
cholesterol levels in blood serum
an anti-venom serum
1 a substance in beauty products that is designed to improve your hair or skin and make it less dry --
2 the watery, colorless part of the blood, or this liquid taken from blood, used for medical purposes --
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.