周六有明显的迹象表明，安全部分处理危机时准备不充分。

There were clear signs on Saturday that the security forces were ill-prepared to handle the crisis.

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准备不充分：你不该成为那个唯一展示自己的笔记、课本和复习表格的人。

Is unprepared: you should not be the only person showing up with notes, your textbook, and the review sheet.

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结果：20例中18例MRU影像均能满足诊断要求，2例患者检查前准备不充分，检查失败。

Results Among the 20 cases, 18 MRU images met the diagnostic need, and 2 cases failed because of poor preparation.

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