基本解释[机械工程]道碴清筛词组短语短语ballast t screening machine 道碴筛分机ballast screening machine [铁路]道碴筛分机Ballast screening machin 道碴清筛机ballast screening machines 道碴清筛机small ballast screening machine 小型枕底清筛机ballast screening更多词组专业释义机械工程道碴清筛