需要注意的是，21期是指数移动平均线，5期是一个简单的移动平均线。
Note that the 21 period is an exponential moving average and the 5 period is a simple moving average.
指数移动平均线是一种给最近价格更多加权并使其更能应对最新信息的移动平均线。
The exponential moving average is a type of moving average that gives more weight to recent prices in an attempt to make it more responsive to new information.
通过观察指数移动平均线的计算，你会发现它更加强调最近的数据点，使其成为一种加权平均。
By looking at the calculation of the EMA, you will notice that more emphasis is placed on the recent data points, making it a type of weighted average.
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