modulation modified modified-frequency
... 船队检修改进计划 fleet improvement program 改进修改频率调制 modulation modified modified-frequency 改进 improve; make better; better; mend; improvement; perfection; melioration 改进书法 improve one's handwriting; 改进工作 make one's work better ...
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modulation modified modified-frequency
调制修改修改频率
以上为机器翻译结果，长、整句建议使用 人工翻译 。