0 an activity that you spend time doing, usually when you are not working -- 嗜好,消遣,娱乐
1 the act of following someone or something to try to catch him, her, or it -- 追踪;追击
2 the act of trying to achieve a plan, activity, or situation, usually over a long period of time -- 追求;从事;实行
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。