名词
中文翻译：开口
同义词：
['mouth', 'aperture例句：1. The ostium of the tunnel is blocked by a large rock.（隧道的开口被一块大石头堵住了。）']
例句：
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1. The ostium of the tunnel is blocked by a large rock.
隧道的开口被一块大石头堵住了。
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2.The scientist carefully observed the ostium of the wound.
科学家仔细地观察伤口的开口。
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3. The ostium of the river was surrounded by lush greenery.
河流的开口被郁郁葱葱的植被包围着。