名词
中文翻译：等级隧道
同义词：
['grade tunnel', 'grade tunneling例句：1. The engineers were discussing the design of the new grade tunnel.（工程师们正在讨论新等级隧道的设计。）']
例句：
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1. The engineers were discussing the design of the new grade tunnel.
工程师们正在讨论新等级隧道的设计。
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2. The grade tunnel is a crucial part of the construction project.
等级隧道是建设项目中至关重要的一部分。
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3.The grade tunnel was constructed to improve traffic flow in the area.
等级隧道的建造是为了改善该地区的交通流量。