0 a condition in which scar tissue grows in the bone marrow so that not enough blood cells are produced for the body -- 特发性髓样化生
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。