undamped vibration

例句：

1. 1. The undamped vibration of the spring is a crucial factor in determining its performance.
   弹簧的无阻振动是决定其性能的关键因素。
2. 2.In order to study the behavior of materials under different conditions, we need to consider their undamped vibrations.
   为了研究不同条件下材料的行为，我们需要考虑它们的无阻振动。
3. 3. The undamped vibration of the structure can be used to predict its dynamic response under external forces.
   结构的无阻振动可以用来预测其在外部力作用下的动力响应。