短語(yǔ)詞組短語(yǔ)steel round coal bucket 鋼圓煤斗Coal bucket lifting device 煤斗提升裝置circle steel coal bucket 鋼圓煤斗suspending coal bucket 懸吊煤斗bucket ladder coal unloading device 鏈斗卸煤機(jī) 返回 coal bucket