Aerial and ground surveys are underway in Madagascar to map the locations of the Malagasy migratory locust swarms.

马达加斯加目前正在进行空中和地面调查，以对这里迁移的蝗虫制作地图。

Most ground surveys involve a lot of walking, looking for surface clues such as small fragments of pottery.

多数地面勘测牵涉大量步行，寻找诸如陶瓷小碎片一样的地表线索。

A tropical forest ground survey revealed that one lightning strike often damages more than 20 trees, a quarter of which can die within a year.

巴拿马：一项热带森林地面调查显示，一次雷击往往会损坏 20 多棵树，其中四分之一会在一年内死亡。