地洞
tunnel; cave; burrow; dugout
地动仪
the world's first seismograph invented by Zhang Heng 张衡 in 132; abbr. for 候風地動儀|候风地动仪
地动山摇
the earth quaked, the mountains shook (idiom); a tremendous battle
候风地动仪
the world's first seismograph invented by Zhang Heng 张衡 in 132
基底动脉
basilar artery (central artery of the brain)