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The ceiling had collapsed, blocking a path to the tunnel opening.
顶板垮塌下来, 堵塞了通往道口的通道.
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The tunnel opening is so narrow that we could only get in there sideways.
洞口太窄了,我们只能侧着身子走进去.
This paper may contribute to the establishment of tunnel opening greening - design, construction and validation standard.
这些成果对于隧道洞口绿化设计施工以及工程质量验收标准的制定都有一定的参考价值.
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