寰椎，第一颈椎脖子上的第一颈椎，支持头颅。

The top or first cervical vertebra of the neck, which supports the skull.

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第一以及第二颈椎折断。

I broke the first and second cervical vertebrae.

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第一以及第二颈椎折断。

I broke the first and second cervical vertebrae.

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