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The technical measures and structure,applied principles of blastproof of ventilation shaft at excavating face,specific operational method and prospective effect are described.

介绍了掘进工崩风筒的主要措施结构、应用原理、采用这的具体操方法达到的预期效果。

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multicrank, multi-cropping, multicrystal, multicultural, multiculturalism, multicusp, multicuspidate, multicut, multicutlathe, multicutter,

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3G, 401(K), a,

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机器停

I could think of nothing but these ventilation shafts.

只能想到这些空气调节筒,却想不出什么别的东西

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听力

Walking through the town, you'll see chimneys and ventilation shafts poking out of the ground.

穿过小镇,你会看到烟囱和通风从地面探出头来。

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And a ventilation shaft that clears the air can become the center of mysteries and conspiracies.

而净化空气的通风也可能成为神秘和阴谋的心。

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I figured it was a safety measure to prevent curious urbanites from accidentally electrocuting themselves or falling down a ventilation shaft.

为这是一种安全措施,可以防好奇的城市居民意外触电或从通风坠落

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multidiameter, multidigit, multidigitato-pinnate, multidimensional, multidirectional, multidisc, multidisciplinary, multidraw, multi-drill, multidrive,

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3G, 401(K), a,
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