0 the temperature at which air can no longer hold all the water in it, and the water starts to form drops on surfaces -- 露点,露点温度(空气中所含的气态水达到饱和而凝结成液态水所需要降至的温度)
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。