短语词组短语scroll -case type vapor-cooling cyclonic separator 蜗壳式汽冷旋风分离器scroll case foundation 蜗壳基础scroll case hoisting 蜗壳挂装scroll case drain 蜗壳排水管scroll case vent 蜗壳通气管scroll case concrete 蜗壳混凝土 返回 scroll case