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1. Oxford Dictionary

   foreshock

   • IPA[ˈfɔːʃɒk]

   英式

   • n.
     a mild tremor preceding the violent shaking movement of an earthquake

   • noun: foreshock, plural noun: foreshocks

2. • 釋義

   n.

   名詞

   • 1. a mild tremor preceding the violent shaking movement of an earthquake a foreshock had been reported before the 1966 earthquake
3. • 更多解釋

   foreshock

   • IPA[ˈfôrˌSHäk]

   美式

   • n.
     a mild tremor preceding the violent shaking movement of an earthquake: a foreshock had been reported before the 1966 earthquake

   Oxford American Dictionary