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laugh1982

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mac194

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laugh1982: ½ð±Ò+5, ·­ÒëEPI+1 2013-08-23 08:13:51
"underground tunnel that is 680 meters below grade"
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"a 680-meter subgrade tunnel"

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     https://www.wbdg.org/design/env_bg_overview.php
5Â¥2013-08-14 04:38:04
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бÑôÁõ·ã

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the tunnel of 680m depth of foundation.¹©²Î¿¼£¡
2Â¥2013-08-12 12:38:52
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andrewzhang

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the tunnel buried at -680 m
3Â¥2013-08-12 16:21:18
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vigor_smile

½ð³æ (Ö°Òµ×÷¼Ò)

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the underground tunnel is situated 680m below
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