以下为句子列表：
英文: Chordomas are rare tumors of notochordal tissue remnants and most frequently affect the sacrum and skull base.
中文: 摘要脊索瘤是来自脊索遗迹的罕见肿瘤，主要侵犯荐椎及颅底。
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英文: Most chordomas are found at skull base, sacrum and cervical spine.
中文: 大多数脊索瘤发生在颅底、颈椎及荐骨。
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