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。
The point on the Earth's surface directly above the focus of an earthquake.
地震中位于震源正上方地球表面上的点。
The source of earthquake wavesthe site beneath the surface where the disturbance originatesis known as the focus.
地震波源地表底下产生扰动的地方称为震源。
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