短語詞組短語water -ballast roller 水鎮(zhèn)重路碾water r ballast 壓艙水water ballast space 壓載水艙water ballast capacity 壓載水艙容量Auxiliary water ballast tank 輔助壓載水艙water ballast hold 水壓艙water ballast chamber [船]底水艙water ballast pollution 壓載水汙染 返回 water ballast