Lesson42Recordinganearthquake
H.H Swinnerton The earth beneath us
Seismo- 地震 seismology 地震学 seismo
An earthquake comes like a thief in the night,(明喻） without warning. It was necessary, therefore, to invent instruments that neither slumbered nor slept. Some devices were quite simple. One, for instance, consisted of rods of various lengths and thicknesses with would stand up on end like ninepins. When a shock came, it shook the rigid table upon which these stood. （定语从句）If it were gentle, only  ...