0 a tax on the use of fuels that produce gases that harm the atmosphere (= the mixture of gases around the earth) -- 烟尘排放税,温室气体排放税
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.
再长的路,一步步也能走完,再短的路,不迈开双脚也无法到达。