hidden tunnel
definitions
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A physical passage or underground corridor that is concealed, secret, or not easily visible to others.zh: 隐藏的隧道
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A metaphorical secret method, route, or way to bypass obstacles or achieve a goal undetected.zh: 秘密途径
examples
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Under cover of darkness, they infiltrated the pass through a hidden tunnel.
在夜色的掩护下,他们通过一条隐藏的隧道渗透进了山口。
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The hacker found a hidden tunnel in the security system to access the data.
黑客在安全系统中找到了一个秘密途径来获取数据。