Zhāng / Héng / fā / míng / de / dì / dòng / yí / shì / shì / jiè / shàng / zuì / zǎo / de / dì / zhèn / yí / qì

张衡发明的地动仪是世界上最早的地震仪器。

The seismograph invented by Zhang Heng was the world's earliest earthquake-detecting instrument.