You will need to join these two data sets.
(您将需要加入这两个数据集。)
That may involve gathering additional data to fill missing values, or to discard some data points that were only present in one of the data sets.
(这可能涉及收集其他数据以填充丢失的值,或丢弃仅在数据集之一中存在的某些数据点。)
Because the join key may differ, you may need to also construct a mapping between the two keys. (由于连接键可能不同,因此您可能还需要在两个键之间构造一个映射。)
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