The distribution characteristics and laws of undergroundcurrent for a change current system with the opposite direction are indicated in this paper.
本文阐明了反向变分流系统地下电流的分布特点和规律。
2
Current estimates suggest that half of all the living matter on Earth lives underground, at depths of up to 5km.
现在估计地球上大约一半的生物生活在地下深度约5千米以下的地方。
3
The fear is that, at current consumption rates, that underground bunker will be empty within 20 years, leaving the earth almost helium-free by the end of the 21st century.