尝试一般化这些层之间的连接被认为是次优选择。
Attempting to generalize connections between these layers is considered sub-optimal.
如果对于看电影而言，你的次优选择就是读那本书的话，那看电影的机会成本就是你看电影花的钱，再加上你因为不能读那本书而放弃的那份愉悦。
If your next-best alternative to seeing the movie is reading the book, then the opportunity cost of seeing the movie is the money spent plus the pleasure you forgo by not reading the book.
通过对防渗类型选择的众多因素进行分析，建立了层次优选模型。
A hierarchical model of optimization selection is built through analysis of multi-influence factors to seepage control type selection.
通过对防渗类型选择的众多因素进行分析，建立了层次优选模型。
A hierarchical model of optimization selection is built through analysis of multi-influence factors to seepage control type selection.
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