每Trace对象包含一组Day对象，定义了当天的最高价、最低价和收盘价。

Within each Trace object is a set of day objects, which define the low, high, and close for that day.

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对于个股上海石化股价给出了最高价、收盘价、最低价的GM(1 1)预测值与实际值的比较。

For the stock of a Shanghai chemical plant, a comparison was done between the highest price, closing price, the GM (1.1) of the lowest price, the predicted value, and the actual value.

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第3步-监控股票的交易在过去在收盘前30分钟，只有在输入股票收盘接近它的高价格当天强烈。

Step 3 - Monitor the stock's trading during the last 30 minutes before the close, and enter only if the stock is closing strong near it's high price of the day.

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