0 a type of sea creature that has a simple body with tentacles and a single opening at the centre, such as a jellyfish or a sea anemone -- 腔肠动物(一种海洋动物,形体简单,有触手,中部为一腔口,如水母、海葵)
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。