dì dòng yí
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
dì dòng shān yáo
the earth quaked, the mountains shook (idiom); a tremendous battle
hòu fēng dì dòng yí
the world's first seismograph invented by Zhang Heng 张衡 in 132