sewer tunnelwater discharge tunnel排水: drain off water; drain away ...隧洞: tunnel放水隧洞: relief tunnel; water release tunnel供水隧洞: water supply tunnel进水隧洞: headrace tunnel; headwater tunnel下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:排水隧洞,即可在微信中查询翻译