| 单词 | tunnel liner |
| 释义 | tunnel liner [`tǝn·ǝl ´līn·ǝr] CIVIL ENGINEERING Any of various materials, especially timber, concrete, and cast iron, applied to the inner surface of a vehicular or railroad tunnel. MINING ENGINEERING The timber, brick, concrete, or steel supports erected in a mine tunnel to maintain dimensions and safe working conditions. |
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