0 the thick, clear liquid substance inside the eye between the lens at the front and the retina at the back -- 玻璃体(晶状体与视网膜之间的无色透明胶状体)
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。