名词
中文翻译：开口
同义词：
['aperture', 'opening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 surgeon carefully removed the ostium of the wound.
外科医生小心地移除了伤口的开口。
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3.The ostium of the river is lined with trees and flowers.
河流的开口处长满了树木和花朵。