Carhart（1997）【I 6】在三因素模型的基础上加入了一个“动量因素”（Momentum factor）构成四因素模型（所谓动量因素是指前一年度收益最高和收益最低的股票或组合的收益差额），从而在模型的应用上弥补了解释“趋势效...
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在过去的很多年有很多研究给出了很多的建议，但事实上，每人每天对水的需求量取决于很多因素，包括您的健康状态、活动量以及生活环境。
Studies have produced varying recommendations over the years but in truth your water needs depend on many factors including your health how active you are and where you live.
在过去的很多年有很多研究给出了很多的建议，但事实上，每人每天对水的需求量取决于很多因素，包括您的健康状态、活动量以及生活环境。
Studies have produced varying recommendations over the years, but in truth, your water needs depend on many factors, including your health, how active you are and where you live.
维持、甚至增加活动量是让你保持自身具有的肺部功能的关健因素。
Maintaining and even increasing your activity level is key to keeping the lung function that you have.
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