短語(yǔ)詞組短語(yǔ)river bed protection material 護(hù)底結(jié)搆型式seed bed base material 苗牀基質(zhì)fluidized bed combustion material 流態(tài)化材料filter bed doubledeck material 雙層濾料濾池bed d material load 底部物質(zhì)負(fù)荷bed -material load 底負(fù)載bed of material 料層 返回 bed material