间盘突出可能是突然发生，或者经过几个星期或几个月逐渐形成的，经常影响到腰部的椎骨。
Disc Herniation may progress suddenly or gradually over weeks or months and it often affects the Lumbar Vertebrae.
频率：突然发生的事件和配合新闻机构的日程安排以及更可能比那些逐渐发生或在白天或晚上不方便次报告。
Frequency: Events which occur suddenly and fit well with the news organization's schedule are more likely to be reported than those which occur gradually or at inconvenient times of day or night.
频率：突然发生的事件和配合新闻机构的日程安排以及更可能比那些逐渐发生或在白天或晚上不方便次报告。
Frequency: Events which occur suddenly and fit well with the news organization's schedule are more likely to be reported than those which occur gradually or at inconvenient times of day or night.
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