Are standard codes used in source fields, such as user department or location codes?
源字段中是否使用标准代码，如用户部门或位置代码？
This allows you to take data from two different source fields and merge them into a single target field.
这允许您从两个不同的源字段获取数据并将它们合并到一个目标字段中。
To keep the Yellow river from flow cutoff is the necessary condition for allowing its riverside source fields alive.
保持黄河不断流是傍河水源地存在的必要条件，黄河频繁的断流威胁傍河开采水源地的稳定性。
However, it is inevitable to decrease the groundwater level around the mining area and even to influence the water supply safety of the constructed groundwater source fields.
为保证矿区安全开采，采矿本身要求排出大量的矿井水，这不可避免地使附近的地下水水位下降，并可能影响到已有地下水水源地的供水安全，产生供、排水矛盾。
However, it is inevitable to decrease the groundwater level around the mining area and even to influence the water supply safety of the constructed groundwater source fields.
为保证矿区安全开采，采矿本身要求排出大量的矿井水，这不可避免地使附近的地下水水位下降，并可能影响到已有地下水水源地的供水安全，产生供、排水矛盾。
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