earthquakesn.地震名词earthquake的复数形式.earthquaken.地震earthquake precursory地震前兆Earthquake triggering地震触发earthquake take place发生地震Earthquakes precursor地震前兆earthquake quiescence地震平静Earthquake propaganda地震宣传earthquake prevention地震预防earthquake subsidence地震陷落earthquake proof wall抗地震壁earthquake safety map地震安全图

1. Seismic waves move out from the focus of an earthquake in all directions.
   地震波从震中向周围的各个方向传播。
2. The apparatus thus described, however, records only the horizontal component of the wave movement.
   然而，仪器的如此描画只能记录地震波运动中的水平方面的运动部分。