英语词汇up-and-down motion是什么意思，up-and-down motion的用法、释义、翻译、读音、例句、短语词组-英汉汉英翻译词典-觉斋网

单词	up-and-down motion
释义	up-and-down motion　【化】垂直方向往复运动; 上下运动
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