只有达到这么一点，传统的指数跟踪在这方面有一个逻辑优势：按照定义，一个以价值为权重的指数代表所有投资者的业绩。
Only up to a point. Conventional index-tracking has a logical advantage on its side: a value-weighted index represents, by definition, the performance of all investors.
模型指数据，视图指表示层，而控制器指应用程序逻辑或业务逻辑。
Model refers to your data, View to your presentation layer, and Controller refers to the application or business logic.
以软件方式实现一般硬件组合逻辑难以达到的指数曲线升频和逆指数曲线降频规律。
Because it is very difficult to realize a frequency pattern as exponent curve rising and inverse exponent curve falling by a common hardware logical combination, so it is achieved by software.
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