A | 在我们做量化交易时，数据是所有策略的基石，不论是回测，还是我们的某些策略都需要用上历史数据，因此怎么在对自己的量化软件中补充数据是非常重要的，下面这篇文章将详细说明怎么做数据补充以及如若出错该怎么处理。 (ECNS) -- China recorded improvements in both air and water quality in the first seven months of 2026, with average PM2.5 concentrations falling 6.2% year on year, Minister of Ecology and Environment Huang Runqiu said Thursday. The average concentration of fine particulate matter, or PM2.5, fell by 1.8 micrograms per cubic meter from a year earlier, while the proportion of days with good air quality increased by 3.9 percentage points, Huang said at a press conference held by the State Council Information Office. The proportion of surface-water monitoring sections meeting Grade I-III water quality standards reached 86.5%, up 2.4 percentage points year on year. Water quality in the main streams of the Yangtze and Yellow rivers remained at Grade II. (By Helen Mo, intern Yang Hongran) 
。一、补充数据库到底是为了做什么？QMT的“补充数据”功能，本质上是将交易所的历史行情数据提前下载并加密保存在你的本地电脑中。它的核心作用体现在以下三个方面：保障回测数据的完整性与高效性：回测的本质是遍历固定的...。
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