At the end, under the constraint of the loss of net returns, the paper studies a safe-first problem on the basis of the centroid, and gives the existence of conditions of the optimal solution.
最后，研究了基于形心向量的具有“净收益”亏损约束的安全-首要模型，并结合图形给出了最优解存在的条件，这一结果是对经典TSF模型的一个自然的推广。
参考来源 - 基于期望收益率排序信息的投资组合选择 （研究生论文）·2,447,543篇论文数据，部分数据来源于NoteExpress
If you would like to start trampolining, you may first need to ask a doctor to make sure it's a safe activity for you.
如果你想开始玩蹦床，你可能首先需要请医生确保这对你是一项安全的活动。
The team built up a safe cushion of two goals in the first half.
那支球队上半场射进两球，奠定了稳操胜券的基础。
Before a vaccine is ever tested on humans, it's first tested on animals to make sure it seems safe.
在疫苗进行人体试验之前，首先要在动物身上进行试验，以确保其安全性。
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