短語(yǔ)詞組短語(yǔ)ownership p retention 所有權(quán)的保留ownership s retention 所有權(quán)保留ownership retention purchase 所有權(quán)保留買(mǎi)賣(mài)ownership retention system 所有權(quán)保留制度retention of ownership 所有權(quán)保留 返回 ownership retention