它们的物理本质相同，而表现形式不同，但是表面现象不那么重要。
Well, the physical reason why they're the same is actually that phenomena are different, but not all that much.
本文就这些现象的原因及表现形式加以归类说明，并给出了具体的解决办法和预防措施。
This article explain on the reason of these phenomenon and sort out the form of expression, provide the concrete solution and precautionary measures.
日历效应是指证券市场出现的在某一特定时间进行交易可以获得超额收益率的现象，它的表现形式主要有星期效应和月份效应。
Calendar effects mean that market returns associate with the specific transaction date in stock market, there re two important forms: day of the week effects and month of the year effects.
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