I loved travelling, so I decided to join a voluntary organisation and was sent to Ecuador to carry out land surveys.

我爱旅游，所以我决定加入一个志愿组织并被派往厄瓜多尔开展土地调查。

Some theories suggest the drones could be flown by private companies conducting land surveys or part of a show like this one.

一些说法认为，这些无人机可能是私人公司进行土地调查用到的，或是像这种表演的一部分。

With government established, federal arms victorious over the Indians, and the lands surveyed for sale, the way was prepared for the immigrants.

——随着政府的建立， 联邦军队战胜了印第安人， 土地被调查出售，为移民铺平了道路。

We estimated that it was about one fifth, and this was endorsed by looking at large-scale usage maps in the town land survey office - 24% to be precise.

我们估计大约是五分之一，而这点通过查看城市土地测量局的大范围地图得以证实，确切的说是24%。