Adding validation methods to a model causes validation to occur before the object is saved into the database.

如果在模型中添加检验方法，那么在对象保存到数据库中之前就会执行检验。

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Adding search data to the model, Dr Watts found, produced no improvement.

而向这个模型添加搜索数据时，瓦茨发现其并没有提高。

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Stub out large portions of the model, then start adding implementation.

去掉大部分模型，然后开始添加实现。

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Adding model diversity always improves the quality of models, and adding modeler diversity improves the quality of the modeling effort!

FORBES: Art and Science, Intertwined

This model expands on the Fama-French Three-Factor Model by adding a stock momentum risk factor.

FORBES: No Free Lunch from Alternative Indexes

AMG, the performance division of Mercedes, is adding the S-Model as a new line.

FORBES: Wonderfully Ludicrous: The 2014 Mercedes-Benz E63 AMG S-Model 4Matic Wagon