沼泽地的

In the swamp the army was beset by mosquitoes.

在, 该军受到蚊子的困扰。

In the swamp we were beset by mosquitoes.

在里, 我们受到蚊子的围攻。

It settles the nonce dangersome problem of crossing through the marshland by foot, and is simple in structure and convenient in use.

它解决了目前过徒步穿越常危险的问题，且结构简单，使用常方便。