“ultrasonic alarm system”概念、定义、翻译-科学时代

单词	ultrasonic alarm system
释义	动力与电气工程词汇手册 ultrasonic alarm system 超声波报警系统
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科学时代收录了1160609条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。