以下为句子列表：
英文: It is found at staged operation that residual cholesteatoma is more frequently encountered at some anatomic sites such as the anterior epitympanum, oval window niche, and hypotympanum near the Eustachian tube.
中文: 由阶段手术得到的经验显示上鼓室之前侧、卵圆窗及下鼓室靠近耳咽管处是胆脂瘤容易残留的部位。
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英文: Residual choleateatoma was found more frequently in the anterior epitympanum, the oval window niche, and the hypotympanum near the tubal orifice.
中文: 容易残存的部位，依序为上鼓室前方、卵圆窗及下鼓室近耳咽管处。
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