短語詞組短語bailer crown -block 撈砂天車sliding crown -block 可平移的天車crown n block 天車g crown -block 可平移的天車straight rotary crown -block 單層天車run into crown -block 碰天車bailer r crown -block 撈砂天車valve -against-overwinding crown-block protector 天車卷閘防碰安裝arch crown block 拱頂石 返回 crown block