a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake)
例句
用作名词(n.)
China's Zhang Heng invented the seismograph during the Han Dynasty.中国的张衡在汉朝时发明了地动仪。
People laughed at Zhang Heng when he first introduced his seismograph, and it was only later that the world recognized his greatness.当初张衡发明出他的地动仪时，人们都在嘲笑他，只有后来全世界才意识到他的伟大。
Earthquakes are recorded with a seismometer, also known as a seismograph.地震检波器，也被称为测振仪，可记录地震。
