Flat terrain to minimize blast effects.

平坦的地形，以减少爆炸的影响。

And we're just bringing that to regions where there are no hills and it's all flat terrain.

我们只是将其带到各个没有丘陵，地势平坦的地方。

Poland's struggled to defend herself against superior enemy numbers who attacked from three different fronts across mostly flat and hard-to-defend terrain.

面对数量众多的敌人从三条不同战线发来的进攻，波兰艰难地保护自己，这些战线几乎都是在平坦且难以防御的地形发动进攻。

So Poland's greatest geographic challenges to overcome have always been establishing a base on the coast and balancing the area's poorly defensible flat terrain against outside attacks from strong powers in every direction.

因此，波兰需要克服的最大地理挑战一直是沿海岸建立基地，平衡该地区防卫性差的平坦地形，抵御来自各个方向强国的外来攻击。