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单词	parametric amplifier
释义	parametric amplifier noun : a high-frequency amplifier whose operation is based on time variations in a parameter (such as reactance) and which converts the energy at the frequency of an alternating current into energy at the input signal frequency in such a way as to amplify the signal Word History First Known Use 1959, in the meaning defined above
随便看	contends contends (with) contends with content content analysis content oneself with content psychology content subject content word contentation contented contentedly contentedness contentednesses contenter contentest contenting contention contentional contentions contentious contentious jurisdiction contentiously contentiousness contentiousnesses

英语词典包含469781条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。