pulsation|pulsations

音乐的低音部分有一种稳定的律动，带动全场一起摇摆。

The bassline of the music had a steady ___pulsation that made everyone sway.

医生用听诊器检测到了病人心脏的规律搏动。

The doctor detected regular ___pulsations in the patient's heart with a stethoscope.

医生用听诊器听到了病人心脏有规律的搏动。

The doctor detected a steady ___pulsation in the patient's heart with the stethoscope.