However, various models make researchers more difficult to choose and construct a research model.

然而众多的理论模式却令研究者面临研究模式选择与建构上的困难。

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You could construct all subsets, check that the weight is less than the weight of the knapsack, and then choose the subset with the maximum value.

你可以构建所有子集，检查重量是否小于背包的重量，然后选择最大值的子集。

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Starting with our use case and list of classes, we choose objects from those classes to interact, and we construct a SQD to show that interaction.

从用例和类表出发，我们从类里选择需要交互的对象，然后构造一张序列图表示这种交互。

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But what is clear is that the IWC's tangled and often conveniently forgotten history gives them reasons for real frustration, and the wherewithal to construct faux frustration if they choose.

BBC: South Korea's whaling: Faux and cons