0 a substance that causes cancer: --
The American government classifies both asbestos and environmental tobacco smoke as class one carcinogens.
1 a substance that can cause cancer (= a serious illness that causes tissues and cells to grow too quickly) --
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.