1. Besides the ways introduced in para1, what other traditional ways do you know the Chinese have to predict earthquakes Water in the well becomes muddy, Seismoscope/Seismograph invented by Zhang Heng Mice run in the street fearlessly 2. What is the most dangerous part in the earthquake to most people? Falling building
水平角测量原理 The Meterage of horizontal Angle Principle J6型光学经纬仪 J6 Optics Theodolite 水平角测量 The Meterage of Horizontal Angle 竖直角测量 The Meterage of Erect Angle 经纬仪的检验与校正 The Inspection and Emendation of Theodolite 经纬仪测角注意事项 The Notice of Measured Angle by Theodolite