基本解释清沟机词组短语短语rotary disk ditch cleaner 转盘式清沟机dragline ditch cleaner 绳索式拖斗清沟机swinging -bucket ditch cleaner 摆斗式清沟机ditch cleaning machine gutter cleaner 清沟机专业释义农业科学沟渠清洁机农用清淤机