synchronous pulsation

例句：

1. 1. The heartbeat of the earth is synchronized with the sun's rotation.
   地球的心跳与太阳的旋转同步。
2. 2. The scientists observed a synchronous pulsation in the electrical field.
   科学家们观察到电场中出现了同步脉动。
3. 3. The researchers found that the synchronous pulsation was caused by the interaction between two particles.
   研究人员发现，同步脉动是由两个粒子之间的相互作用引起的。