megasonicWiktionary 原文英美构词拆解megamega-前缀sonicsonic词干mega-(originally) Very large, great. · In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by one million (106).词源说明From mega- + sonic.释义形容词adjective1Having a frequency much greater than ultrasonic, typically above 1000 kHz