ㄉㄧˋㄉㄨㄥˋˊdìdòngyí

地动仪
  1. 候風地動儀簡稱東漢科學家發明用來測定地震儀器世界上第地震儀

the world's first seismograph invented by Zhang Heng 张衡 in 132, abbr. for 候風地動儀