不着地 meaning in Chinese

mile high

We tore right along , over rocks , rubbish , gullies , open fields ? ? sometimes , with one or two wheels on the ground , but generally with none
（我们驾着马车飞奔向前，穿过岩石、垃圾、溪谷、空地? ?有时只一个车轮着地有时轮不着地地向前飞跑）。
I was busy one morning upon some thing of this kind , when i call d to friday , and bid him go to the sea shore , and see if he could find a turtle , or tortoise , a thing which we generally got once a week , for the sake of the eggs , as well as the flesh : friday had not been long gone , when he came running back , and flew over my outer wall , or fence , like one that felt not the ground , or the steps he set his feet on ; and before i had time to speak to him , he cries out to me , o master
我们每星期总要抓一两只回来，吃它的蛋和肉。星期五去了不久，就飞也似地跑回来，一纵身跳进外墙，他跑得飞快，仿佛脚不着地似的。我还来不及问他是怎么回事，他就大叫道： "主人，主人，不好了，不好了！