sound-pulse decay

例句：

1. 1. The sound of the waves is gradually fading away.
   海浪的声音逐渐消失。
2. 2. The pulse in his wrist was getting weaker and weaker.
   他的手腕脉搏越来越弱。
3. 3. The sound-pulse decay model is widely used in medical imaging.
   声脉冲衰减模型在医学成像中广泛应用。