circular tunnel lining圆形: circular; round隧道: tunnel; tunneling; tunnellin ...衬: line; place sth. underneath砌: opera隧道衬砌: lining of tunnel; tunnel lining; tunnel-liner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:圆形隧道衬砌，即可在微信中查询翻译
