pre-shock stage

例句：

1. 1.The earthquake was followed by a pre-shock stage of shaking.
   地震之后出现了前震阶段。
2. 2. During the pre-shock stage, it's important to stay calm and assess the situation.
   在预震阶段，重要的是保持冷静并评估情况。
3. 3. Researchers have identified several factors that contribute to the pre-shock stage of an earthquake.
   研究人员已经识别出几个因素，这些因素对地震的预震阶段有贡献。