But mules still perform this work in some roadless areas of the western United States.

骡子仍然在美国西部一些没有道路的地区从事这项工作。

It's this remarkably wild landscape, one of the largest roadless areas in the Lower 48.

这是一片非荒凉的景观，是美国本土 48 州最大的无路地区之一。

Intagliata: It's true—when I think conservation, I think of roadless stretches of the Sierra Nevada, or remote patches of the Desert Mojave.

Intagliata：这是真的——当我护时，我会内华达山脉的无路延伸地带，或莫哈韦沙漠的偏远地区。