她认为对于已经有一次未能通过测试的小学教师而言，要学习并通过考试，最主要的问题可能是时间和资源。
She thinks the main problems facing primary school teachers who've already failed the test once might be the time and resources to study and pass.
最后，用直接方法求出问题的综合最优解，并通过计算证明，对于不同的工程目标和具体要求，综合最优解可以有不同的取值。
Finally, the comprehensive optimum was solved with direct method, and proved it could have different numerical value to different engineering objective and detailed demands.
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