0 offered at a lower price than usual for certain people, for example students or old people -- (对学生、老少或失业人群的)价格优惠的,减价的
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。