名词
中文翻译：隧道前部
同义词：
['front of a tunnel', 'tunnel entrance', 'tunnel face']
例句：
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1. The tunnel front is linedwith rocks and boulders.
隧道前部被岩石和巨石所包围。
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2. The tunnelfront was covered in snow during the winter.
隧道前部在冬天覆盖着雪。
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3. Thetunnel front was blocked by a large boulder.
隧道前部被一块大石头堵住了。