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From: MDBG CC-CEDICT Chinese-English Dictionary 漢英字典

 候風地動儀 [ㄏㄡˋ ㄈㄥ ㄉㄧˋ ㄉㄨㄥˋ ㄧˊ; hou4 feng1 di4 dong4 yi2]
 the world's first seismograph invented by Zhang Heng 张衡 in 132
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