0 a bad situation or habit that, after it has started, is likely to get very much worse -- 滑坡效应(指坏情况或恶习一旦开始就很可能变得愈加严重)
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。