英语词汇ultrasonic transmitter简单造句、意思、用法及例句-英语例句辞典

单词	ultrasonic transmitter
例句	原声例句科学60秒听力 2015年6月合集 The device uses an attached ultrasonic transmitter and a sensor that vibrates the cane to warn its users when an obstacle is within three meters. 这种手杖安装了超声波发射器和传感器，3米之内出现障碍物时就会通过振动向手杖主人发出警报。
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