青云翻译

Because the surface is not a variety of obstacles, so any seasonal accessibility by optimizing the way.

Because the surface there are no obstructions, so any season by optimizing road barrier-free access.

Because, the surface does not have each kind of obstacle, therefore any season through optimizes the road to pass through without the barrier.

Because, the surface is free of all obstructions, so any season road through the optimization of accessibility.

Because the surface there are no obstructions, so any season by optimizing road barrier-free access.