“沼泽地”用英语怎么说？

他们无法把重型迫击炮移过那片沼泽地.They could not move their heavy mortars over the swampy ground.在沼泽地,该军受到蚊子的困扰.In the swamp the army was beset by mosquitoes.我们不得不穿过那片沼泽地.We had to cross the marshes....