0 a piece of equipment used by scientists for filtering (= passing liquids through a layer of material to remove solid pieces) -- 布赫纳漏斗,布氏漏斗
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。