tunnel lining隧道: tunnel; tunneling; tunnellin ...洞: hole; cavity衬: line; place sth. underneath砌: opera隧道(洞): 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:隧道(洞)衬砌,即可在微信中查询翻译