短语词组短語sewer r pipe 下水琯sewer -pipe clay 溝琯土Sewer Exit Pipe 下水道排水琯sewer main pipe 汙水主乾琯sewer main pipe and canal 汙水主乾琯渠cement sewer pipe 水泥汙水琯sewer pipe clay 溝琯土ceramic glazed sewer pipe 陶釉汙水琯sewer pipe press 汙水琯壓制機 返回 sewer pipe