In a classic tale, Hansel and Gretel dropped breadcrumbs (面包屑) while walking through a (risk) forest so that they wouldn't lose their way. Drawing inspiration from this, scientists believe rovers (探测器) may one day use a similar trick to move across other planets losing their data.
Typically, all the information a rover (gather) before will be lost if it permanently loses communication during a mission. (avoid) this, scientists suggest using a multi-rover system in which a "son rover" is connected to a "mother rover". The son rover would then go into any especially uncertain area, such as a cave, (move) on to spread sensors the size of breadcrumbs along the way, which could then communicate (direct) with each other through a wireless network and channel any collected data back to the mother rover. As a (prove) of concept, theoretical physicist Wolfgang Fink's team built their first "breadcrumb" sensors communicating via Wi-Fi.
This is just one of the most impressive applications come to your knowledge in terms of the breadcrumb strategy. It can also be useful here on Earth because a rover can (send) with the "breadcrumb" sensors to disaster-stricken areas and transfer(传送) the information to people, no matter dangerous it is.
