They could not move their heavy mortars over the swampy ground.

他们无法把重型迫击炮移过那片沼泽地。

youdao

However, the swampy terrain was a breeding ground for mosquitoes, which carried a variety of diseases - dysentery, malaria, smallpox - that the English were unaccustomed to.

然而，这里的沼泽地形滋生了大量的蚊子，成了携带了多种疾病的温床：痢疾，疟疾，天花。英国无法适应这样的环境。

youdao

One night in early autumn, with the swampy ground of the Nature Preserve papered with fallen leaves, I was hunkered down to examine a dead snake about a foot in length whose color I thought might in life have been green, when, as I stood, I felt something brush the top of my head.

NEWYORKER: Wakefield

The ground was soft and swampy, fallen tree branches lay over the paths, I heard the obsessive self-hypnotizing cicadas, the gulp of the bullfrogs, and knew with an animal sense only lately developed in me that there were some four-footed creatures about.

NEWYORKER: Wakefield