0 to move at the same speed as someone or something that is moving forward so that you stay level with them -- не отставать
1 to increase or make progress at the same speed as something or someone else so that you stay at the same level as them -- не отставать, держаться на том же уровне
2 to be able to understand or deal with something that is happening or changing very fast -- не отставать
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.
Мы можем выполнить ее шаг за шагом, какой бы длинной ни была дорога, и она не может быть завершена, какой бы короткой ни была дорога, если вы даже не обозначите свой след.