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单词
pilot tunnel
释义
pilot tunnel
pilot tunnel
[
′pī·lət ‚tən·əl
]
(engineering)
A small tunnel or shaft excavated in advance of the main drivage in mining and tunnel building to gain information about the ground, create a free face, and thus simplify the blasting operations.
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更新时间:2025/3/16 9:12:33