方向性的结尾方式：其与建议性的唯一差别就是对问题解决提出总的，大体的方向或者指明前景
[1]Many solutions are being offered here, all of them make some sense, but none is adequate enough. The problem should be recognized in a wide way .
[2]There is no quick method to the issue of …, but … might be helpful/benefical.
[3]The great challenge today is … There is much difficulty, but …
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新东方英语四级：https://www.thea.cn/wx1820/
