保留用于将来的操作系统扩展
可选元素数组保留用于放置扩展可能需要的元素。
An array of the optional elements reserved to accommodate elements that may be needed by extensions.
脑脊髓液之抽取应保留用于有症状之颅内压升高之情形。
Removing cerebrospinal fluid should be reserved for cases where there is symptomatic raised intracranial pressure.
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