0 If something harmful is unchecked, it is continuing or increasing without or despite any limits or attempts to prevent it. -- (有害物)未受约束的,不受限制的,放任的
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。