现代金融学的许多经典问题，如套利定价原理以及风险中性定价等都可以用随机折现因子模型理解，随机折现因子模型是资产定价模型的统一框架。

Through the stochastic discount factor model, it is easy to understand some classical problems of modern finance, such as arbitrage pricing theory and risk neutral pricing, etc.

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19世纪的角色模型是基于对自由意志的理解。

The 19th-century character model was based on an understanding of free will.

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例如，物理学可以让你观察并理解世界，但也可以将观察到的现象整合成模型，提炼出理论或定律用以对未来做出预测。

For instance, physics allows you to observe and rationalise the world, but also to integrate observations into models and, sometimes, models into theories or laws that can be used to make predictions.

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This is a feature of DNA shown in this cartoon form, so if you can keep that sort of schematic in mind, it makes it a lot easier to understand the detailed structure.

这是卡通模型所表现的DNA的特点之一,如果你能把这个模型记住,你会很容易理解DNA分子的详细结构

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