构建一个时间系列后，您可能想要检索历史数据。
Once you have built up a time series, you will probably want to retrieve historical data.
对于此示例，我们将使用一年的变化区间检索历史记录。
For this sample, we'll retrieve the history using a sliding interval of one year.
History服务支持在检索历史记录值时使用各种时间范围。
The history service supports a wide range of time ranges when retrieving the history values.
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