Primary screw perforation was the most frequent problem (14%) followed by secondary screw perforation (8%) and avascular necrosis (8%).

第一枚螺钉穿入是最常见的并发症(14%)，其次为第二枚螺钉穿入(8%)和缺血性坏死(8%)。

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Doctors say frequent headaches and migraines are among the most common childhood health complaints, yet the problem gets surprisingly little attention from the medical community.

医生说，频繁的头疼和偏头疼是最为常见的儿科疾病之一。至今这个问题还没引起医学界的足够重视。

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By far the most frequent discussion about cases of dual diagnosis involves the problem in diagnosis.

目前，人们讨论的最多的是双重诊断里的有关难题。

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Olson, in her annual report to Congress, issued today, identified the most serious problem facing taxpayers as Congress' own habit of making frequent, last-minute changes to the tax code.

FORBES: Taxpayers' Biggest Problem? Congress, Says Report