0 a thick substance, usually containing medicine, that is put on the skin where it is sore or where there is an injury, in order to cure it -- 藥膏,軟膏,油膏
eye ointment 眼藥膏
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。