1·Another haunted and related natural phenomenon is known as frequency infrasonic sound waves.
另一种与闹鬼相关的自然现象是称作次声的低频声波。
2·According to the characteristics of infrasonic sound effect on human body, the principle of nonlethal infrasonic weapon for on site control is put forward.
根据次声对人体作用的特点，提出了现场可控非致命次声武器的概念。
3·The primary results show that the ultra low-frequency pulses may produce in the process of nucleation of micro-cracks and faults, and transmit to the air as infrasonic sound.
初步结果表明，微破裂的集结和断层的破裂起始会出现超低频脉冲，并透射到空气中形成次声波。