0 one of a pair of glands that produce adrenalin, found just above the kidneys -- 腎上腺(腎臟上方製造腎上腺素的一對腺體)
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。