短语词组短语bucket t trencher 斗式挖沟机bucket wheel trencher [机]斗轮式挖沟机chain bucket trencher [机]链斗式挖沟机;链斗式挖沟机multi -bucket trencher 多斗式挖沟机endless -bucket trencher 轮式挖沟机disk and bucket trencher 轮斗式开沟机 返回 bucket trencher