0 a network of tubes within a cell that transports substances inside the cell and is needed for the production of proteins --
1 a network of tubes within a cell that transports substances inside the cell and is needed for the production of proteins (= chemicals that are a necessary part of cells of living things) --
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.