orifice [ˈɒrɪfɪs]

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n.孔，口

an opening or hole , especially one in the body , such as the mouth

A mouse ran out from the dark orifice of the cave.一只老鼠从黑暗的洞口跑出。
An endless flow of words streamed from the same orifice.一连串滔滔不绝的话都是同一张嘴巴讲出来的。