0 to remove something -- 拿走,移走
1 to subtract a number (= remove it from another number) -- 減,減去
Four take away two is two. 4減2等於2。
If you take 4 away from 12 you get 8. 12減4等於8。
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。