User2 will make some changes to the models and deliver them to the main stream.
User2将会对模型做一些更改，并将这些更改交付给主流程。
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。
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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