This radar is a kind of low frequency radar and is able to explore surface of Mars deep to several kilometers, thus it can get mass data about the underground conditions of Mars.

这种雷达是一种低频雷达，能够对几公里厚的火星表层进行探测，因而可以获得有关火星地下情况的大量数据。

youdao

Francois Couder, 43, began working at the age of 17 laying underground cable in hazardous conditions for state-run France Telecom. The company has since been privatized.

43岁，从17岁时就开始为国有的法国电信工作：在比较危险的环境中铺设地下电缆。该公司现在已被私有化。

youdao

Francois Couder, 43, began working at the age of 17 laying underground cable in hazardous conditions for state-run France Telecom.

Francois Couder, 43岁，从17岁时就开始为国有的法国电信工作：在比较危险的环境中铺设地下电缆。

youdao

It will be based on conditions underground.

NPR: Bush Again Rejects Calls for Troop Pullout

Their maps detailed road conditions, power outages, underground gas storage, and facilities with hazardous materials.

CNN: 'Geocoding' used to locate Katrina survivors

Freak conditions have caused massive disruption to London Underground trains.

BBC: Weather and travel latest