“超声波的”例句

单词 超声波的 例句 DEFINITIVE EXAMPLES 权威例句〔pitch〕Ultrasonic waves are at a higher pitch than the human ear can hear.超声波的音高超出了人耳可以听见的范围。朗文当代〔second〕Ultrasonic waves travel at around 300 metres per second .超声波的传播速度约...