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earthquake Seismograph Zhang heng seismograph
03-29
Ice Book Folding chairs tangram Seismograph
02-08
Luban Warring states Seismograph Zhang heng Mozi
01-04
Lu Xun Zhang heng Xu Zhimo Famous poems Seismograph The Book of Poetry
01-01
Bian Que Seismograph Yue Fei Zhang heng
12-20