pipeline crossing in tunnel
... 水平定向钻穿越 Crossing by horizontal directional drilling 隧道穿越 Pipeline crossing in tunnel 钻爆法隧道 Tunnel by digging ...
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pipeline crossing in tunnel
隧道管道穿越
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Tunnel is a low cost way for crossing river pipeline projects in long-distance, but crossing river cracks are main difficulties in karst areas.
隧道是长输管道工程中一种成本较低的穿跨越形式，但对于岩溶发达地区的大型河流，通江裂缝等地质条件是其主要施工难点。
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