pulse solid rocket engine

例句：

1. 1. The pulse of the engine was strong and steady.
   发动机的脉搏强劲而稳定。
2. 2. His heart began to race as he faced his fear.
   面对恐惧时，他的心脏开始加速跳动。
3. 3. The doctor checked her pulse and found it to be normal.
   医生检查了她的脉搏，发现它是正常的。